feat: unified Claude API key and profile system with z.AI, MiniMax, OpenRouter support (#600)

* feat: add Claude API provider profiles for alternative endpoints

Add support for managing multiple Claude-compatible API endpoints
(z.AI GLM, AWS Bedrock, etc.) through provider profiles in settings.

Features:
- New ClaudeApiProfile type with base URL, API key, model mappings
- Pre-configured z.AI GLM template with correct model names
- Profile selector in Settings > Claude > API Profiles
- Clean switching between profiles and direct Anthropic API
- Immediate persistence to prevent data loss on restart

Profile support added to all execution paths:
- Agent service (chat)
- Ideation service
- Auto-mode service (feature agents, enhancements)
- Simple query service (title generation, descriptions, etc.)
- Backlog planning, commit messages, spec generation
- GitHub issue validation, suggestions

Environment variables set when profile is active:
- ANTHROPIC_BASE_URL, ANTHROPIC_AUTH_TOKEN/API_KEY
- ANTHROPIC_DEFAULT_HAIKU/SONNET/OPUS_MODEL
- API_TIMEOUT_MS, CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC

apps/ui/src/lib/http-api-client.ts

@@ -1657,8 +1657,8 @@ export class HttpApiClient implements ElectronAPI {
       this.post('/api/features/delete', { projectPath, featureId }),
     getAgentOutput: (projectPath: string, featureId: string) =>
       this.post('/api/features/agent-output', { projectPath, featureId }),
-    generateTitle: (description: string) =>
-      this.post('/api/features/generate-title', { description }),
+    generateTitle: (description: string, projectPath?: string) =>
+      this.post('/api/features/generate-title', { description, projectPath }),
     bulkUpdate: (projectPath: string, featureIds: string[], updates: Partial<Feature>) =>
       this.post('/api/features/bulk-update', { projectPath, featureIds, updates }),
     bulkDelete: (projectPath: string, featureIds: string[]) =>
@@ -1743,13 +1743,15 @@ export class HttpApiClient implements ElectronAPI {
       originalText: string,
       enhancementMode: string,
       model?: string,
-      thinkingLevel?: string
+      thinkingLevel?: string,
+      projectPath?: string
     ): Promise<EnhancePromptResult> =>
       this.post('/api/enhance-prompt', {
         originalText,
         enhancementMode,
         model,
         thinkingLevel,
+        projectPath,
       }),
   };