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/settings-view/providers/claude-settings-tab.tsx

@@ -7,6 +7,7 @@ import { ClaudeMdSettings } from '../claude/claude-md-settings';
 import { ClaudeUsageSection } from '../api-keys/claude-usage-section';
 import { SkillsSection } from './claude-settings-tab/skills-section';
 import { SubagentsSection } from './claude-settings-tab/subagents-section';
+import { ApiProfilesSection } from './claude-settings-tab/api-profiles-section';
 import { ProviderToggle } from './provider-toggle';
 import { Info } from 'lucide-react';
 
@@ -45,6 +46,10 @@ export function ClaudeSettingsTab() {
         isChecking={isCheckingClaudeCli}
         onRefresh={handleRefreshClaudeCli}
       />
+
+      {/* API Profiles for Claude-compatible endpoints */}
+      <ApiProfilesSection />
+
       <ClaudeMdSettings
         autoLoadClaudeMd={autoLoadClaudeMd}
         onAutoLoadClaudeMdChange={setAutoLoadClaudeMd}