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/hooks/use-project-settings-loader.ts

@@ -23,6 +23,7 @@ export function useProjectSettingsLoader() {
   const setAutoDismissInitScriptIndicator = useAppStore(
     (state) => state.setAutoDismissInitScriptIndicator
   );
+  const setCurrentProject = useAppStore((state) => state.setCurrentProject);
 
   const loadingRef = useRef<string | null>(null);
   const currentProjectRef = useRef<string | null>(null);
@@ -107,6 +108,28 @@ export function useProjectSettingsLoader() {
               result.settings.autoDismissInitScriptIndicator
             );
           }
+
+          // Apply activeClaudeApiProfileId if present
+          // This is stored directly on the project, so we need to update the currentProject
+          // Type assertion needed because API returns Record<string, unknown>
+          const settingsWithProfile = result.settings as Record<string, unknown>;
+          const activeClaudeApiProfileId = settingsWithProfile.activeClaudeApiProfileId as
+            | string
+            | null
+            | undefined;
+          if (activeClaudeApiProfileId !== undefined) {
+            const updatedProject = useAppStore.getState().currentProject;
+            if (
+              updatedProject &&
+              updatedProject.path === requestedProjectPath &&
+              updatedProject.activeClaudeApiProfileId !== activeClaudeApiProfileId
+            ) {
+              setCurrentProject({
+                ...updatedProject,
+                activeClaudeApiProfileId,
+              });
+            }
+          }
         }
       } catch (error) {
         console.error('Failed to load project settings:', error);