feat(T3): validare completa prezentari + 29 teste

- app/validation.py: reguli de continut (VIN ^[A-HJ-NPR-Z0-9]{17}$ fara O/I/Q,
  nrInm ^[A-Z0-9]{1,10}$, dataPrestatie ∈ [2024-12-01, azi] TZ Bucuresti,
  R-ODO/I-ODO -> odometruInitial obligatoriu, odometruInitial<=odometruFinal,
  odometruFinal numeric, prestatii nevide, b64Image base64 valid)
- erori structurate {field, message} (aceeasi forma ca raspunsul RAR), fara exceptii
- modele Pydantic: normalizare strip/upper pe vin/nrInm/coduri
- router /v1/prezentari: validare inainte de enqueue; esec continut -> needs_data
  (tinut, vizibil in dashboard cu motiv), NU 422; JSON malformat -> 422 (shape)
- tests/: 29 teste (per regula + rutare API + idempotenta)

Verify: pytest 29 passed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/v1/router.py

@@ -18,6 +18,7 @@ from fastapi import APIRouter, HTTPException
 from ...db import get_connection
 from ...idempotency import idempotency_key
 from ...models import PrezentareRequest, PrezentariResponse, SubmissionResult
+from ...validation import validate_prezentare
 
 router = APIRouter(prefix="/v1", tags=["v1"])
 
@@ -26,8 +27,9 @@ router = APIRouter(prefix="/v1", tags=["v1"])
 def create_prezentari(req: PrezentareRequest) -> PrezentariResponse:
     """Enqueue una/mai multe prezentari. Idempotent: continut identic -> acelasi submission.
 
-    TODO(T3): validare Pydantic completa inainte de enqueue (VIN/data/nrInm),
-              ruteaza needs_data/needs_mapping.
+    Validarea de continut (T3, app.validation) ruleaza inainte de enqueue:
+    esecurile NU resping cererea, ci enqueue-aza cu status `needs_data` + motiv
+    (plan.md sect. 3). JSON malformat -> 422 din Pydantic (validare de shape).
     TODO(auth): rezolva account_id din API key (acum None).
     Nota: rar_credentials NU se persista (zero-storage) — worker-ul le va primi
           pe alt canal (T2); in schelet enqueue-ul doar stocheaza prezentarea.
@@ -53,12 +55,20 @@ def create_prezentari(req: PrezentareRequest) -> PrezentariResponse:
                     )
                 )
                 continue
+
+            # T3: validare de continut -> queued daca e curat, altfel needs_data + motiv.
+            errors = validate_prezentare(content)
+            if errors:
+                status, rar_error = "needs_data", json.dumps(errors, ensure_ascii=False)
+            else:
+                status, rar_error = "queued", None
+
             cur = conn.execute(
-                "INSERT INTO submissions (idempotency_key, account_id, status, payload_json) "
-                "VALUES (?, ?, 'queued', ?)",
-                (key, account_id, json.dumps(content, ensure_ascii=False)),
+                "INSERT INTO submissions (idempotency_key, account_id, status, payload_json, rar_error) "
+                "VALUES (?, ?, ?, ?, ?)",
+                (key, account_id, status, json.dumps(content, ensure_ascii=False), rar_error),
             )
-            results.append(SubmissionResult(submission_id=int(cur.lastrowid), status="queued"))
+            results.append(SubmissionResult(submission_id=int(cur.lastrowid), status=status))
     finally:
         conn.close()
     return PrezentariResponse(results=results)