feat: implement WebRTC signaling and UDP-based video streaming and control service

server/docs/swagger.yaml

@@ -2219,18 +2219,24 @@ paths:
       - system
   /api/video/control:
     post:
-      description: Sends a text command (e.g. start, stop, left, right) to the ESP32
-        command port (UDP 8888).
+      description: Sends a text command or a JSON control packet to the ESP32 command
+        port (UDP 8888).
       parameters:
       - description: Device ID (0..127)
         in: query
         name: id
         type: integer
-      - description: Command text
+      - description: Command text (legacy)
         in: query
         name: cmd
-        required: true
         type: string
+      - description: Control packet JSON (steer, throttle, brake, gear, flags)
+        in: body
+        name: body
+        schema:
+          additionalProperties:
+            type: integer
+          type: object
       produces:
       - application/json
       responses:
@@ -2240,7 +2246,7 @@ paths:
             additionalProperties: true
             type: object
         "400":
-          description: Missing cmd parameter
+          description: Missing parameter or invalid body
           schema:
             type: string
         "500":