fix: Add missing OpenRouter and Gemini settings to settingKeys array

Settings persistence was broken because 7 setting keys were missing from
the settingKeys array in SettingsRoutes.ts handleUpdateSettings():

- CLAUDE_MEM_GEMINI_RATE_LIMITING_ENABLED
- CLAUDE_MEM_OPENROUTER_API_KEY
- CLAUDE_MEM_OPENROUTER_MODEL
- CLAUDE_MEM_OPENROUTER_SITE_URL
- CLAUDE_MEM_OPENROUTER_APP_NAME
- CLAUDE_MEM_OPENROUTER_MAX_CONTEXT_MESSAGES
- CLAUDE_MEM_OPENROUTER_MAX_TOKENS

Phase 1/5 of PR #448 fix plan.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/services/worker/http/routes/SettingsRoutes.ts

@@ -84,6 +84,14 @@ export class SettingsRoutes extends BaseRouteHandler {
       'CLAUDE_MEM_PROVIDER',
       'CLAUDE_MEM_GEMINI_API_KEY',
       'CLAUDE_MEM_GEMINI_MODEL',
+      'CLAUDE_MEM_GEMINI_RATE_LIMITING_ENABLED',
+      // OpenRouter Configuration
+      'CLAUDE_MEM_OPENROUTER_API_KEY',
+      'CLAUDE_MEM_OPENROUTER_MODEL',
+      'CLAUDE_MEM_OPENROUTER_SITE_URL',
+      'CLAUDE_MEM_OPENROUTER_APP_NAME',
+      'CLAUDE_MEM_OPENROUTER_MAX_CONTEXT_MESSAGES',
+      'CLAUDE_MEM_OPENROUTER_MAX_TOKENS',
       // System Configuration
       'CLAUDE_MEM_DATA_DIR',
       'CLAUDE_MEM_LOG_LEVEL',