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/project-settings-view/project-settings-view.tsx

@@ -5,6 +5,7 @@ import { Button } from '@/components/ui/button';
 import { ProjectIdentitySection } from './project-identity-section';
 import { ProjectThemeSection } from './project-theme-section';
 import { WorktreePreferencesSection } from './worktree-preferences-section';
+import { ProjectClaudeSection } from './project-claude-section';
 import { DangerZoneSection } from '../settings-view/danger-zone/danger-zone-section';
 import { DeleteProjectDialog } from '../settings-view/components/delete-project-dialog';
 import { ProjectSettingsNavigation } from './components/project-settings-navigation';
@@ -84,6 +85,8 @@ export function ProjectSettingsView() {
         return <ProjectThemeSection project={currentProject} />;
       case 'worktrees':
         return <WorktreePreferencesSection project={currentProject} />;
+      case 'claude':
+        return <ProjectClaudeSection project={currentProject} />;
       case 'danger':
         return (
           <DangerZoneSection