feat(settings): add OpenAI/Google API key support and unified ModelId type

- Add OpenAI API key storage to store-api-key handler
- Include Google/OpenAI key status in credentials API responses
- Add unified ModelId type for Claude, Codex, Cursor, OpenCode, and dynamic providers
- Update PhaseModelEntry to support all provider model types

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

@@ -431,6 +431,8 @@ export class SettingsService {
    */
   async getMaskedCredentials(): Promise<{
     anthropic: { configured: boolean; masked: string };
+    google: { configured: boolean; masked: string };
+    openai: { configured: boolean; masked: string };
   }> {
     const credentials = await this.getCredentials();
 
@@ -444,6 +446,14 @@ export class SettingsService {
         configured: !!credentials.apiKeys.anthropic,
         masked: maskKey(credentials.apiKeys.anthropic),
       },
+      google: {
+        configured: !!credentials.apiKeys.google,
+        masked: maskKey(credentials.apiKeys.google),
+      },
+      openai: {
+        configured: !!credentials.apiKeys.openai,
+        masked: maskKey(credentials.apiKeys.openai),
+      },
     };
   }