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/server/src/services/settings-service.ts

@@ -166,6 +166,41 @@ export class SettingsService {
       needsSave = true;
     }
 
+    // Migration v4 -> v5: Auto-create "Direct Anthropic" profile for existing users
+    // If user has an Anthropic API key in credentials but no profiles, create a
+    // "Direct Anthropic" profile that references the credentials and set it as active.
+    if (storedVersion < 5) {
+      try {
+        const credentials = await this.getCredentials();
+        const hasAnthropicKey = !!credentials.apiKeys?.anthropic;
+        const hasNoProfiles = !result.claudeApiProfiles || result.claudeApiProfiles.length === 0;
+        const hasNoActiveProfile = !result.activeClaudeApiProfileId;
+
+        if (hasAnthropicKey && hasNoProfiles && hasNoActiveProfile) {
+          const directAnthropicProfile = {
+            id: `profile-${Date.now()}-direct-anthropic`,
+            name: 'Direct Anthropic',
+            baseUrl: 'https://api.anthropic.com',
+            apiKeySource: 'credentials' as const,
+            useAuthToken: false,
+          };
+
+          result.claudeApiProfiles = [directAnthropicProfile];
+          result.activeClaudeApiProfileId = directAnthropicProfile.id;
+
+          logger.info(
+            'Migration v4->v5: Created "Direct Anthropic" profile using existing credentials'
+          );
+        }
+      } catch (error) {
+        logger.warn(
+          'Migration v4->v5: Could not check credentials for auto-profile creation:',
+          error
+        );
+      }
+      needsSave = true;
+    }
+
     // Update version if any migration occurred
     if (needsSave) {
       result.version = SETTINGS_VERSION;
@@ -372,6 +407,7 @@ export class SettingsService {
     ignoreEmptyArrayOverwrite('recentFolders');
     ignoreEmptyArrayOverwrite('mcpServers');
     ignoreEmptyArrayOverwrite('enabledCursorModels');
+    ignoreEmptyArrayOverwrite('claudeApiProfiles');
 
     // Empty object overwrite guard
     if (
@@ -597,6 +633,17 @@ export class SettingsService {
       };
     }
 
+    // Handle activeClaudeApiProfileId special cases:
+    // - "__USE_GLOBAL__" marker means delete the key (use global setting)
+    // - null means explicit "Direct Anthropic API"
+    // - string means specific profile ID
+    if (
+      'activeClaudeApiProfileId' in updates &&
+      updates.activeClaudeApiProfileId === '__USE_GLOBAL__'
+    ) {
+      delete updated.activeClaudeApiProfileId;
+    }
+
     await writeSettingsJson(settingsPath, updated);
     logger.info(`Project settings updated for ${projectPath}`);