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-settings-migration.ts

@@ -206,6 +206,10 @@ export function parseLocalStorageSettings(): Partial<GlobalSettings> | null {
         worktreePanelCollapsed === 'true' || (state.worktreePanelCollapsed as boolean),
       lastProjectDir: lastProjectDir || (state.lastProjectDir as string),
       recentFolders: recentFolders ? JSON.parse(recentFolders) : (state.recentFolders as string[]),
+      // Claude API Profiles
+      claudeApiProfiles: (state.claudeApiProfiles as GlobalSettings['claudeApiProfiles']) ?? [],
+      activeClaudeApiProfileId:
+        (state.activeClaudeApiProfileId as GlobalSettings['activeClaudeApiProfileId']) ?? null,
     };
   } catch (error) {
     logger.error('Failed to parse localStorage settings:', error);
@@ -326,6 +330,20 @@ export function mergeSettings(
     merged.currentProjectId = localSettings.currentProjectId;
   }
 
+  // Claude API Profiles - preserve from localStorage if server is empty
+  if (
+    (!serverSettings.claudeApiProfiles || serverSettings.claudeApiProfiles.length === 0) &&
+    localSettings.claudeApiProfiles &&
+    localSettings.claudeApiProfiles.length > 0
+  ) {
+    merged.claudeApiProfiles = localSettings.claudeApiProfiles;
+  }
+
+  // Active Claude API Profile ID - preserve from localStorage if server doesn't have one
+  if (!serverSettings.activeClaudeApiProfileId && localSettings.activeClaudeApiProfileId) {
+    merged.activeClaudeApiProfileId = localSettings.activeClaudeApiProfileId;
+  }
+
   return merged;
 }
 
@@ -671,6 +689,8 @@ export function hydrateStoreFromSettings(settings: GlobalSettings): void {
     },
     mcpServers: settings.mcpServers ?? [],
     promptCustomization: settings.promptCustomization ?? {},
+    claudeApiProfiles: settings.claudeApiProfiles ?? [],
+    activeClaudeApiProfileId: settings.activeClaudeApiProfileId ?? null,
     projects,
     currentProject,
     trashedProjects: settings.trashedProjects ?? [],
@@ -732,6 +752,8 @@ function buildSettingsUpdateFromStore(): Record<string, unknown> {
     keyboardShortcuts: state.keyboardShortcuts,
     mcpServers: state.mcpServers,
     promptCustomization: state.promptCustomization,
+    claudeApiProfiles: state.claudeApiProfiles,
+    activeClaudeApiProfileId: state.activeClaudeApiProfileId,
     projects: state.projects,
     trashedProjects: state.trashedProjects,
     currentProjectId: state.currentProject?.id ?? null,