chore: add api docs (#1965)

docs/api/memo-resource.md

@@ -0,0 +1,65 @@
+# Memo Resource APIs
+
+## Bind Resource to Memo
+
+```
+POST /api/v1/memo/:memoId/resource
+```
+
+**Request Body**
+
+```json
+{
+  "resourceId": 123
+}
+```
+
+**Response**
+
+```
+true
+```
+
+**Status Codes**
+
+- 200: OK
+- 400: Invalid request
+- 401: Unauthorized
+- 404: Memo/Resource not found
+- 500: Internal server error
+
+## Get Memo Resources
+
+```
+GET /api/v1/memo/:memoId/resource
+```
+
+**Response**
+
+```json
+[
+  {
+    "id": 123,
+    "filename": "example.png"
+    // other resource fields
+  }
+]
+```
+
+**Status Codes**
+
+- 200: OK
+- 500: Internal server error
+
+## Unbind Resource from Memo
+
+```
+DELETE /api/v1/memo/:memoId/resource/:resourceId
+```
+
+**Status Codes**
+
+- 200: OK
+- 401: Unauthorized
+- 404: Memo/Resource not found
+- 500: Internal server error