docs(readme): update free-tier provider status for 2026

Outdated free-tier info was misleading new users. Sync corrections into
README.md and README.zh-CN.md, and force IPv4-first DNS resolution in the
CLI launcher to avoid undici IPv6 connect timeouts (502).

- Kiro AI: free tier now ~50 credits/month (was "Unlimited FREE")
- Qwen Code / Gemini CLI: free tiers discontinued in 2026
- OpenCode Free: note free model list fluctuates
- Vertex AI: Gemini API no longer uses $300 free credits since Mar 2026
- cli/cli.js: spawn server/tray with --dns-result-order=ipv4first

README.md

@@ -84,7 +84,7 @@ npm install -g 9router
 
 **2. Connect a FREE provider (no signup needed):**
 
-Dashboard → Providers → Connect **Kiro AI** (free Claude unlimited) or **OpenCode Free** (no auth) → Done!
+Dashboard → Providers → Connect **Kiro AI** (~50 credits/month free: Claude 4.5 + GLM-5 + MiniMax) or **OpenCode Free** (no auth) → Done!
 
 **3. Use in your CLI tool:**
 
@@ -337,12 +337,12 @@ Default URLs:
       <td align="center" width="150">
         <img src="./public/providers/kiro.png" width="70" alt="Kiro"/><br/>
         <b>Kiro AI</b><br/>
-        <sub>Claude 4.5 + GLM-5 + MiniMax<br/>Unlimited FREE</sub>
+        <sub>Claude 4.5 + GLM-5 + MiniMax<br/>50 credits/month free</sub>
       </td>
       <td align="center" width="150">
         <img src="./public/providers/opencode.png" width="70" alt="OpenCode Free"/><br/>
         <b>OpenCode Free</b><br/>
-        <sub>No auth • Auto-fetch models<br/>Unlimited FREE</sub>
+        <sub>No auth • Auto-fetch models<br/>Free (model list varies)</sub>
       </td>
       <td align="center" width="150">
         <img src="./public/providers/gemini.png" width="70" alt="Vertex AI"/><br/>
@@ -353,7 +353,11 @@ Default URLs:
   </table>
 </div>
 
-> **Note:** iFlow, Qwen and Gemini CLI free tiers were discontinued in 2026. Use Kiro / OpenCode Free / Vertex instead.
+> **Note:** iFlow, Qwen Code and Gemini CLI free tiers were discontinued in 2026. Use Kiro / OpenCode Free / Vertex instead.
+>
+> **Kiro AI** moved to a paid model in Sep 2025 — the free tier is now capped at **50 credits/month** (plus 500 trial credits for new accounts in the first 30 days). Paid tiers: Pro $20/mo (1,000 credits), Pro+ $40/mo (2,000), Pro Max $100/mo (5,000), Power $200/mo (10,000).
+> **OpenCode Free** model list fluctuates over time (some models free only for limited promos) — subject to change without notice.
+> **Vertex AI**: the $300 free credit for new GCP accounts is still valid, but since Mar 2026 the **Gemini API endpoint no longer consumes these credits** — call the **Vertex AI Studio** endpoint instead.
 
 ### 🔑 API Key Providers (40+)
 
@@ -607,8 +611,8 @@ Seamless translation between formats:
 > The "cost" displayed in Usage Analytics is **for tracking and comparison purposes only**.
 > 9Router itself **never charges** you anything. You only pay providers directly (if using paid services).
 >
-> **Example:** If your dashboard shows "$290 total cost" while using iFlow models, this represents
-> what you would have paid using paid APIs directly. Your actual cost = **$0** (iFlow is free unlimited).
+> **Example:** If your dashboard shows "$290 total cost" while using Kiro free models, this represents
+> what you would have paid using paid APIs directly. Your actual cost = **$0** (Kiro free tier: ~50 credits/mo).
 >
 > Think of it as a "savings tracker" showing how much you're saving by using free models or
 > routing through 9Router!
@@ -636,9 +640,9 @@ Seamless translation between formats:
 | **💰 CHEAP**        | GLM-5.1 / GLM-4.7     | $0.6/1M      | Daily 10AM       | Budget backup                           |
 |                     | MiniMax M2.7          | $0.2/1M      | 5-hour rolling   | Cheapest option                         |
 |                     | Kimi K2.5             | $9/mo flat   | 10M tokens/mo    | Predictable cost                        |
-| **🆓 FREE**         | Kiro AI               | $0           | Unlimited        | Claude 4.5 + GLM-5 + MiniMax free       |
-|                     | OpenCode Free         | $0           | Unlimited        | No auth, auto-fetch models              |
-|                     | Vertex AI             | $300 credits | New GCP accounts | Gemini 3 Pro + DeepSeek + GLM-5         |
+ | **🆓 FREE**         | Kiro AI               | $0           | 50 credits/mo    | Claude 4.5 + GLM-5 + MiniMax free (paid tiers above) |
+ |                     | OpenCode Free         | $0           | Varies*          | No auth, auto-fetch models (list changes over time) |
+ |                     | Vertex AI             | $300 credits | New GCP accounts | Gemini 3 Pro + DeepSeek + GLM-5 (use Vertex AI Studio endpoint for free credits) |
 
 **💡 Pro Tip:** RTK + Kiro AI + OpenCode Free combo = **$0 cost + 20-40% token savings**!
 
@@ -651,7 +655,7 @@ Seamless translation between formats:
 ✅ **9Router software = FREE forever** (open source, never charges)  
 ✅ **Dashboard "costs" = Display/tracking only** (not actual bills)  
 ✅ **You pay providers directly** (subscriptions or API fees)  
-✅ **FREE providers stay FREE** (iFlow, Kiro, Qwen = $0 unlimited)  
+✅ **FREE providers stay FREE** (Kiro ~50 credits/mo, OpenCode Free, Vertex $300 credits = $0 within free-tier limits) — note iFlow/Qwen/Gemini CLI free tiers were discontinued in 2026
 ❌ **9Router never sends invoices** or charges your card
 
 **How Cost Display Works:**
@@ -667,7 +671,7 @@ Dashboard Display:
 • Display Cost: $290
 
 Reality Check:
-• Provider: iFlow (FREE unlimited)
+• Provider: Kiro (free tier: ~50 credits/mo)
 • Actual Payment: $0.00
 • What $290 Means: Amount you SAVED by using free models!
 ```
@@ -707,7 +711,7 @@ vs. $20 + hitting limits = frustration
 
 ```
 Combo: "free-forever"
-  1. kr/claude-sonnet-4.5      (Claude 4.5 free unlimited)
+  1. kr/claude-sonnet-4.5      (Claude 4.5 free via Kiro, ~50 credits/mo)
   2. kr/glm-5                  (GLM-5 free via Kiro)
   3. oc/<auto>                 (OpenCode Free, no auth)
 
@@ -727,7 +731,7 @@ Combo: "always-on"
   2. cx/gpt-5.5                (second subscription)
   3. glm/glm-5.1               (cheap, resets daily)
   4. minimax/MiniMax-M2.7      (cheapest, 5h reset)
-  5. kr/claude-sonnet-4.5      (free unlimited)
+  5. kr/claude-sonnet-4.5      (free via Kiro, ~50 credits/mo)
 
 Result: 5 layers of fallback = zero downtime
 Monthly cost: $20-200 (subscriptions) + $10-20 (backup)
@@ -761,7 +765,7 @@ The dashboard tracks your token usage and displays **estimated costs** as if you
 **Example:**
 
 - **Dashboard shows:** "$290 total cost"
-- **Reality:** You're using iFlow (FREE unlimited)
+- **Reality:** You're using Kiro free models (~50 credits/mo)
 - **Your actual cost:** **$0.00**
 - **What $290 means:** Amount you **saved** by using free models instead of paid APIs!
 
@@ -787,21 +791,21 @@ The cost display is a "savings tracker" to help you understand your usage patter
 <details>
 <summary><b>🆓 Are FREE providers really unlimited?</b></summary>
 
-**Yes!** The current FREE providers (Kiro, OpenCode Free, Vertex) are genuinely free with **no hidden charges**.
+**Mostly!** The current FREE providers (Kiro, OpenCode Free, Vertex) are genuinely free, but free tiers have limits:
 
 These are free services offered by those respective companies:
 
-- **Kiro AI**: Free unlimited Claude 4.5 + GLM-5 + MiniMax via AWS Builder ID / Google / GitHub OAuth
-- **OpenCode Free**: No-auth passthrough proxy, models auto-fetched from `opencode.ai/zen/v1/models`
-- **Vertex AI**: $300 free credits for new Google Cloud accounts (90 days)
+- **Kiro AI**: ~50 credits/month free (plus 500 trial credits for new accounts in the first 30 days) via AWS Builder ID / Google / GitHub OAuth. Paid tiers available above that.
+- **OpenCode Free**: No-auth passthrough proxy, models auto-fetched from `opencode.ai/zen/v1/models`. The free model list fluctuates over time (some models free only for limited promos) — subject to change without notice.
+- **Vertex AI**: $300 free credits for new Google Cloud accounts (90 days). Since Mar 2026 the Gemini API endpoint no longer consumes these credits — use the **Vertex AI Studio** endpoint instead.
 
-9Router just routes your requests to them - there's no "catch" or future billing. They're truly free services, and 9Router makes them easy to use with fallback support.
+9Router just routes your requests to them - there's no "catch" or future billing from 9Router itself. They're truly free services, and 9Router makes them easy to use with fallback support.
 
 **Discontinued free tiers (no longer recommended):**
 
 - ❌ **iFlow**: Was free unlimited, now changed to paid (2026)
-- ❌ **Qwen Code**: Free OAuth tier discontinued by Alibaba on 2026-04-15
-- ❌ **Gemini CLI**: Still works, but using it with non-CLI tools (Claude, Codex, Cursor...) may result in account bans — only use if you stick to Gemini CLI itself
+- ❌ **Qwen Code**: Free OAuth tier fully discontinued by Alibaba on 2026-04-15
+- ❌ **Gemini CLI**: Service fully shut down by Google on 2026-06-18 (replaced by the closed-source Antigravity CLI). Discontinued — do not use.
 
 </details>
 
@@ -813,12 +817,12 @@ These are free services offered by those respective companies:
 1. **Start with 100% free combo:**
 
    ```
-   1. gc/gemini-3-flash (180K/month free from Google)
-   2. if/kimi-k2-thinking (unlimited free from iFlow)
-   3. qw/qwen3-coder-plus (unlimited free from Qwen)
+   1. kr/glm-5 (GLM-5 free via Kiro, ~50 credits/mo)
+   2. OpenCode Free models (no auth, auto-fetched)
+   3. Vertex AI Gemini 3 Pro (using the Vertex AI Studio endpoint with $300 credits)
    ```
 
-   **Cost: $0/month**
+   **Cost: $0/month** (within Kiro's free credit cap; OpenCode/Vertex subject to their free-tier limits)
 
 2. **Add cheap backup** only if you need it:
 
@@ -1043,7 +1047,7 @@ Monthly cost example (100M tokens):
 ```
 Name: free-combo
 Models:
-  1. kr/claude-sonnet-4.5 (Claude 4.5 free unlimited)
+  1. kr/claude-sonnet-4.5 (Claude 4.5 free via Kiro, ~50 credits/mo)
   2. kr/glm-5 (GLM-5 free via Kiro)
   3. vertex/gemini-3.1-pro-preview ($300 free credits)
 
@@ -1308,7 +1312,7 @@ Notes:
 - `kimi/kimi-k2.5`
 - `kimi/kimi-k2.5-thinking`
 
-**Kiro (`kr/`)** - FREE unlimited:
+**Kiro (`kr/`)** - Free (~50 credits/month, paid tiers above):
 
 - `kr/claude-sonnet-4.5`
 - `kr/claude-haiku-4.5`