refactor: made pydantic check the input.

no longer by the code itself.

ref: N25B-198

src/control_backend/api/v1/endpoints/program.py

@@ -1,9 +1,7 @@
 import logging
 
-from fastapi import APIRouter, HTTPException, Request
-from pydantic import ValidationError
+from fastapi import APIRouter, Request
 
-from control_backend.schemas.message import Message
 from control_backend.schemas.program import Program
 
 logger = logging.getLogger(__name__)
@@ -11,20 +9,12 @@ router = APIRouter()
 
 
 @router.post("/program", status_code=202)
-async def receive_message(program: Message, request: Request):
+async def receive_message(program: Program, request: Request):
     """
-    Receives a BehaviorProgram as a stringified JSON list inside `message`.
+    Receives a BehaviorProgram, pydantic checks it.
     Converts it into real Phase objects.
     """
     logger.debug("Received raw program: %s", program)
-    raw_str = program.message  # This is the JSON string
-
-    # Validate program
-    try:
-        program = Program.model_validate_json(raw_str)
-    except ValidationError as e:
-        logger.error("Failed to validate program JSON: %s", e)
-        raise HTTPException(status_code=400, detail="Not a valid program") from None
 
     # send away
     topic = b"program"