update the readme files

backend/README.md

@@ -46,7 +46,7 @@ cp env.example .env   # update MCP URLs + LLM settings
    - `rag.ingest` - Ingest text content into knowledge base
    - `rag.delete` - Delete individual or all documents for a tenant
    - `rag.list` - List all documents for a tenant with pagination
-   - `web.search` - DuckDuckGo-based web search
+   - `web.search` - Google Programmable Search (Custom Search API) web search
    - `admin.getRules`, `admin.addRule`, `admin.deleteRule`, `admin.logViolation`
    
    **HTTP Endpoints** (for direct API access):
@@ -149,7 +149,7 @@ Use the helper scripts in the repo root when validating backend changes:
 Defined in `env.example`:
 
 - `RAG_MCP_URL` - Default: `http://localhost:8900/rag` (unified MCP server)
-- `WEB_MCP_URL` - Default: `http://localhost:8900/web` (unified MCP server)
+- `WEB_MCP_URL` - Default: `http://localhost:8900/web` (unified MCP server for Google web search)
 - `ADMIN_MCP_URL` - Default: `http://localhost:8900/admin` (unified MCP server)
 - `MCP_PORT` - Port for unified MCP server (default: 8900)
 - `MCP_HOST` - Host for unified MCP server (default: 0.0.0.0)
@@ -158,6 +158,7 @@ Defined in `env.example`:
 - `SUPABASE_URL`, `SUPABASE_SERVICE_KEY` - **Required for Supabase backend** (admin rules + analytics)
   - If not set, the system automatically falls back to SQLite in `data/` directory
   - See `SUPABASE_SETUP.md` in the root directory for detailed setup instructions
+- `GOOGLE_SEARCH_API_KEY`, `GOOGLE_SEARCH_CX_ID` - Credentials for Google Programmable Search used by `web.search`
 - `APP_ENV`, `LOG_LEVEL`, `API_PORT`
 
 Update these before starting the servers to ensure the agent can reach every MCP endpoint and LLM runtime.
@@ -217,7 +218,7 @@ Agents that speak the Model Context Protocol should connect to the `integrachat`
 | `rag` | `ingest` | Chunk + store new knowledge | `POST /rag/ingest` |
 | `rag` | `list` | List all documents for tenant | `GET /rag/list?tenant_id={id}` |
 | `rag` | `delete` | Remove one/all stored documents | `DELETE /rag/delete/{id}?tenant_id={id}` or `DELETE /rag/delete-all?tenant_id={id}` |
-| `web` | `search` | DuckDuckGo English-biased search | `POST /web/search` |
+| `web` | `search` | Google Programmable Search (Custom Search API) | `POST /web/search` |
 | `admin` | `getRules` | Fetch tenant governance rules (list or detailed) | `POST /admin/getRules` |
 | `admin` | `addRule` | Insert or update a rule | `POST /admin/addRule` |
 | `admin` | `deleteRule` | Remove a rule by text | `POST /admin/deleteRule` |