docs: fix OSS REST API endpoint discrepancies (#4555)

Co-authored-by: utkarsh240799 <utkarsh240799@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/open-source/features/rest-api.mdx

@@ -13,6 +13,10 @@ The Mem0 REST API server exposes every OSS memory operation over HTTP. Run it al
   - You plan to explore or debug endpoints through the built-in OpenAPI page at `/docs`.
 </Info>
 
+<Warning>
+  **OSS vs Platform API paths:** The self-hosted OSS server does **not** use the `/v1/` prefix. For example, the endpoint is `POST /memories`, not `POST /v1/memories/`. The [API Reference](/api-reference) documents the hosted platform at `api.mem0.ai` which uses `/v1/` paths — those do not apply to the OSS server.
+</Warning>
+
 <Warning>
   Enable API key authentication (see below) and HTTPS before exposing the server to anything beyond your internal network.
 </Warning>
@@ -147,13 +151,18 @@ curl -X POST http://localhost:8000/memories \
 </Info>
 
 ```bash
-curl "http://localhost:8000/memories/search?user_id=alice&query=vegetable"
+curl -X POST http://localhost:8000/search \
+  -H "Content-Type: application/json" \
+  -d '{
+    "query": "vegetable",
+    "user_id": "alice"
+  }'
 ```
 
 ### Explore with OpenAPI docs
 
-1. Navigate to `http://localhost:8000/docs`.  
-2. Pick an endpoint (e.g., `POST /memories/search`).  
+1. Navigate to `http://localhost:8000/docs`.
+2. Pick an endpoint (e.g., `POST /search`).  
 3. Fill in parameters and click **Execute** to try requests in-browser.
 
 <Tip>
@@ -162,6 +171,25 @@ curl "http://localhost:8000/memories/search?user_id=alice&query=vegetable"
 
 ---
 
+## Endpoint reference
+
+The OSS REST server exposes the following endpoints. None use the `/v1/` prefix.
+
+| Method | Path | Description |
+|--------|------|-------------|
+| `POST` | `/configure` | Set memory configuration |
+| `POST` | `/memories` | Create memories |
+| `GET` | `/memories` | Get all memories (filter by `user_id`, `agent_id`, or `run_id`) |
+| `GET` | `/memories/{memory_id}` | Get a specific memory |
+| `PUT` | `/memories/{memory_id}` | Update a memory |
+| `DELETE` | `/memories/{memory_id}` | Delete a specific memory |
+| `DELETE` | `/memories` | Delete all memories for an identifier |
+| `GET` | `/memories/{memory_id}/history` | Get memory history |
+| `POST` | `/search` | Search memories |
+| `POST` | `/reset` | Reset all memories |
+
+---
+
 ## Verify the feature is working
 
 - Hit the root route and `/docs` to confirm the server is reachable.