feat: add RAG search endpoint with content extraction

- Add /rag/search endpoint for web, news, and image search via SearXNG
- Add /content/extract and /content/extract/batch endpoints
- Add ContentExtractor client using Trafilatura for content extraction
- Enhance HybridRAG web search with full content extraction
- Add Redis caching for search results
- Add new configuration options for search and extraction timeouts

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

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

src/main.py

@@ -45,7 +45,10 @@ app.add_middleware(
 )
 
 # Register routers
-from src.routers import wiki, tools, graph, vector, hybrid_rag, consolidation, ingestion, entity_linking, webhooks
+from src.routers import (
+    wiki, tools, graph, vector, hybrid_rag, consolidation,
+    ingestion, entity_linking, webhooks, rag_search, content
+)
 
 app.include_router(wiki.router)
 app.include_router(tools.router)
@@ -56,6 +59,8 @@ app.include_router(consolidation.router)
 app.include_router(ingestion.router)
 app.include_router(entity_linking.router)
 app.include_router(webhooks.router)
+app.include_router(rag_search.router)
+app.include_router(content.router)
 
 # Mount static files directory for Wiki.js integration scripts
 static_dir = Path(__file__).parent.parent / "static"