feat(grok-cli): add Grok CLI / Grok Build provider with OAuth device-code flow (#2502)

New OAuth provider routing through cli-chat-proxy.grok.com (OpenAI Responses
API), distinct from xai (api.x.ai) and grok-web (cookie SSO):

- Registry + GrokCliExecutor: Chat Completions -> Responses transform, CLI
  fingerprint headers, virtual effort models grok-4.5-{low,medium,high}
- OAuth device-code flow (auth.x.ai) with no-PKCE, shared xAI token refresh
- store=false multi-turn continuity via reasoning encrypted_content
- Quota tracker: on-demand window + prepaid balance on dashboard
- Connection test: 402 spending-limit = soft success (auth OK, out of credits)
- Alias/oauth/provider baselines + unit tests

tests/__baseline__/alias-baseline.json

@@ -66,6 +66,10 @@
     "vertex-partner": "vertex-partner",
     "gw": "grok-web",
     "grok-web": "grok-web",
+    "gcli": "grok-cli",
+    "gb": "grok-cli",
+    "grok-build": "grok-cli",
+    "grok-cli": "grok-cli",
     "pw": "perplexity-web",
     "perplexity-web": "perplexity-web",
     "mimo": "xiaomi-mimo",
@@ -104,6 +108,7 @@
     "chutes": "chutes",
     "claude": "cc",
     "cline": "cl",
+    "clinepass": "clinepass",
     "cloudflare-ai": "cloudflare-ai",
     "codebuddy-cn": "cbcn",
     "codex": "cx",
@@ -119,11 +124,13 @@
     "gitlab": "gitlab",
     "glm": "glm",
     "glm-cn": "glm-cn",
+    "grok-cli": "gcli",
     "grok-web": "grok-web",
     "groq": "groq",
     "hyperbolic": "hyperbolic",
     "iflow": "if",
     "kilocode": "kc",
+    "kimchi": "kimchi",
     "kimi": "kimi",
     "kimi-coding": "kmc",
     "kiro": "kr",
@@ -147,6 +154,7 @@
     "qwen": "qw",
     "siliconflow": "siliconflow",
     "together": "together",
+    "venice": "venice",
     "vercel-ai-gateway": "vercel-ai-gateway",
     "vertex": "vertex",
     "vertex-partner": "vertex-partner",
@@ -168,6 +176,7 @@
     "cc",
     "cerebras",
     "cl",
+    "clinepass",
     "cloudflare-ai",
     "cohere",
     "comfyui",
@@ -181,6 +190,7 @@
     "fal-ai",
     "fireworks",
     "gc",
+    "gcli",
     "gemini",
     "gemini-tts-models",
     "gemini-tts-voices",
@@ -194,6 +204,7 @@
     "hyperbolic",
     "if",
     "kc",
+    "kimchi",
     "kimi",
     "kmc",
     "kr",
@@ -224,6 +235,7 @@
     "siliconflow",
     "stability-ai",
     "together",
+    "venice",
     "vertex",
     "vertex-partner",
     "volcengine-ark",