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/components/views/board-view/shared/enhancement/enhance-with-ai.tsx

@@ -13,6 +13,7 @@ import { toast } from 'sonner';
 import { getElectronAPI } from '@/lib/electron';
 import { ModelOverrideTrigger, useModelOverride } from '@/components/shared';
 import { EnhancementMode, ENHANCEMENT_MODE_LABELS } from './enhancement-constants';
+import { useAppStore } from '@/store/app-store';
 
 const logger = createLogger('EnhanceWithAI');
 
@@ -56,6 +57,9 @@ export function EnhanceWithAI({
   const [enhancementMode, setEnhancementMode] = useState<EnhancementMode>('improve');
   const [enhanceOpen, setEnhanceOpen] = useState(false);
 
+  // Get current project path for per-project Claude API profile
+  const currentProjectPath = useAppStore((state) => state.currentProject?.path);
+
   // Enhancement model override
   const enhancementOverride = useModelOverride({ phase: 'enhancementModel' });
 
@@ -69,7 +73,8 @@ export function EnhanceWithAI({
         value,
         enhancementMode,
         enhancementOverride.effectiveModel,
-        enhancementOverride.effectiveModelEntry.thinkingLevel
+        enhancementOverride.effectiveModelEntry.thinkingLevel,
+        currentProjectPath
       );
 
       if (result?.success && result.enhancedText) {