feat(web-search): tool DuckDuckGo abierta en /web-search para watsonx Orchestrate

Sub-app FastAPI montada en /web-search con búsqueda vía ddgs.
OpenAPI 3.0.3 + servers absoluto + operationId webSearch listo para
importar como external tool en wxO. Sin auth (uso de taller/demo).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/main.py

@@ -7,6 +7,7 @@ from fastapi.staticfiles import StaticFiles
 from app import admin, benefits_api, frontend, reports_api
 from app.config import get_settings
 from app.db import init_db
+from app.web_search import web_search_app
 
 settings = get_settings()
 
@@ -36,6 +37,8 @@ app.mount(
     name="reports_output",
 )
 
+app.mount("/web-search", web_search_app)
+
 
 @app.on_event("startup")
 def on_startup() -> None: