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-sync.ts

@@ -72,6 +72,8 @@ const SETTINGS_FIELDS_TO_SYNC = [
   'defaultTerminalId',
   'promptCustomization',
   'eventHooks',
+  'claudeApiProfiles',
+  'activeClaudeApiProfileId',
   'projects',
   'trashedProjects',
   'currentProjectId', // ID of currently open project
@@ -628,6 +630,8 @@ export async function refreshSettingsFromServer(): Promise<boolean> {
       defaultEditorCommand: serverSettings.defaultEditorCommand ?? null,
       defaultTerminalId: serverSettings.defaultTerminalId ?? null,
       promptCustomization: serverSettings.promptCustomization ?? {},
+      claudeApiProfiles: serverSettings.claudeApiProfiles ?? [],
+      activeClaudeApiProfileId: serverSettings.activeClaudeApiProfileId ?? null,
       projects: serverSettings.projects,
       trashedProjects: serverSettings.trashedProjects,
       projectHistory: serverSettings.projectHistory,