feat: add get ip endpoint

* rename handler
* change rate limit

server/swagger.yaml

@@ -519,6 +519,20 @@ paths:
           description: Invalid request body
         '401':
           description: Unauthorized
+  /ip:
+    get:
+      summary: Get client IP address
+      responses:
+        '200':
+          description: IP address
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  ip:
+                    type: string
+                    example: '127.0.0.1'
 
 components:
   schemas: