feat: add OpenRouter provider support and enhance context generation

Added support for OpenRouter as an alternative LLM provider with new settings for API key, model selection, and app metadata configuration.

Enhanced context generation with improved settings management and updated worker service APIs.

Includes UI updates for context settings and new observation type configurations.

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

@@ -13,6 +13,7 @@ import { SessionManager } from '../../SessionManager.js';
 import { DatabaseManager } from '../../DatabaseManager.js';
 import { SDKAgent } from '../../SDKAgent.js';
 import { GeminiAgent, isGeminiSelected, isGeminiAvailable } from '../../GeminiAgent.js';
+import { OpenRouterAgent, isOpenRouterSelected, isOpenRouterAvailable } from '../../OpenRouterAgent.js';
 import type { WorkerService } from '../../../worker-service.js';
 import { BaseRouteHandler } from '../BaseRouteHandler.js';
 import { SessionEventBroadcaster } from '../../events/SessionEventBroadcaster.js';
@@ -29,6 +30,7 @@ export class SessionRoutes extends BaseRouteHandler {
     private dbManager: DatabaseManager,
     private sdkAgent: SDKAgent,
     private geminiAgent: GeminiAgent,
+    private openRouterAgent: OpenRouterAgent,
     private eventBroadcaster: SessionEventBroadcaster,
     private workerService: WorkerService
   ) {
@@ -41,12 +43,20 @@ export class SessionRoutes extends BaseRouteHandler {
 
   /**
    * Get the appropriate agent based on settings
-   * Throws error if Gemini is selected but not configured (no silent fallback)
+   * Throws error if provider is selected but not configured (no silent fallback)
    *
    * Note: Session linking via claudeSessionId allows provider switching mid-session.
    * The conversationHistory on ActiveSession maintains context across providers.
    */
-  private getActiveAgent(): SDKAgent | GeminiAgent {
+  private getActiveAgent(): SDKAgent | GeminiAgent | OpenRouterAgent {
+    if (isOpenRouterSelected()) {
+      if (isOpenRouterAvailable()) {
+        logger.debug('SESSION', 'Using OpenRouter agent');
+        return this.openRouterAgent;
+      } else {
+        throw new Error('OpenRouter provider selected but no API key configured. Set CLAUDE_MEM_OPENROUTER_API_KEY in settings or OPENROUTER_API_KEY environment variable.');
+      }
+    }
     if (isGeminiSelected()) {
       if (isGeminiAvailable()) {
         logger.debug('SESSION', 'Using Gemini agent');
@@ -61,7 +71,10 @@ export class SessionRoutes extends BaseRouteHandler {
   /**
    * Get the currently selected provider name
    */
-  private getSelectedProvider(): 'claude' | 'gemini' {
+  private getSelectedProvider(): 'claude' | 'gemini' | 'openrouter' {
+    if (isOpenRouterSelected() && isOpenRouterAvailable()) {
+      return 'openrouter';
+    }
     return (isGeminiSelected() && isGeminiAvailable()) ? 'gemini' : 'claude';
   }
 
@@ -104,13 +117,13 @@ export class SessionRoutes extends BaseRouteHandler {
    */
   private startGeneratorWithProvider(
     session: ReturnType<typeof this.sessionManager.getSession>,
-    provider: 'claude' | 'gemini',
+    provider: 'claude' | 'gemini' | 'openrouter',
     source: string
   ): void {
     if (!session) return;
 
-    const agent = provider === 'gemini' ? this.geminiAgent : this.sdkAgent;
-    const agentName = provider === 'gemini' ? 'Gemini' : 'Claude SDK';
+    const agent = provider === 'openrouter' ? this.openRouterAgent : (provider === 'gemini' ? this.geminiAgent : this.sdkAgent);
+    const agentName = provider === 'openrouter' ? 'OpenRouter' : (provider === 'gemini' ? 'Gemini' : 'Claude SDK');
 
     logger.info('SESSION', `Generator auto-starting (${source}) using ${agentName}`, {
       sessionId: session.sessionDbId,