fix(ollama-local): support custom host URL for remote Ollama servers (closes #578)

Add a shared resolveOllamaLocalHost() helper and wire it through the
executor, models/validate/test routes, so users can point ollama-local
at a remote Ollama instance instead of being locked to localhost:11434.

Also expose the host as an "Ollama Host URL" field in AddApiKeyModal
(empty = default localhost:11434), making the option reachable from the
dashboard without hand-editing db.json.

Co-authored-by: anuragg-saxenaa <anuragg.saxenaa@gmail.com>
Made-with: Cursor

src/app/api/providers/validate/route.js

@@ -2,12 +2,13 @@ import { NextResponse } from "next/server";
 import { getProviderNodeById } from "@/models";
 import { isOpenAICompatibleProvider, isAnthropicCompatibleProvider } from "@/shared/constants/providers";
 import { getDefaultModel } from "open-sse/config/providerModels.js";
+import { resolveOllamaLocalHost } from "open-sse/config/providers.js";
 
 // POST /api/providers/validate - Validate API key with provider
 export async function POST(request) {
   try {
     const body = await request.json();
-    const { provider, apiKey } = body;
+    const { provider, apiKey, providerSpecificData } = body;
 
     if (!provider || (!apiKey && provider !== "ollama-local")) {
       return NextResponse.json({ error: "Provider and API key required" }, { status: 400 });
@@ -183,7 +184,7 @@ export async function POST(request) {
             siliconflow: "https://api.siliconflow.cn/v1/models",
             hyperbolic: "https://api.hyperbolic.xyz/v1/models",
             ollama: "https://ollama.com/api/tags",
-            "ollama-local": "http://localhost:11434/api/tags",
+            "ollama-local": `${resolveOllamaLocalHost({ providerSpecificData })}/api/tags`,
             assemblyai: "https://api.assemblyai.com/v1/account",
             nanobanana: "https://api.nanobananaapi.ai/v1/models",
             chutes: "https://llm.chutes.ai/v1/models",