feat(import): T7 batch_id scope reresolve_account — R1 INCHIS

- reresolve_account(conn, account_id, batch_id=None):
  - batch_id specificat -> scope la batch-ul exact (import commit explicit)
  - fara batch_id (POST /v1/mapari) -> EXCLUSIV canal API (batch_id IS NULL)
  - salvarea unei mapari NU mai re-queues randuri cross-batch (R1 inchis)
- 6 teste: izolare batch A/B, regresie API canal, batch explicit nu atinge API,
  schema batch_id/row_index, 3 batches izolate

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/mapping.py

@@ -298,16 +298,20 @@ def reresolve_account(conn, account_id: int | None, batch_id: int | None = None)
     mapping = {op: meta["cod_prestatie"] for op, meta in mapping_meta.items()}
 
     if batch_id is not None:
-        # T7: scope la batch-ul specificat
+        # T7: scope la batch-ul specificat (import commit explicit).
+        # NU atinge randuri din alte batches sau din feed API.
         rows = conn.execute(
             "SELECT id, payload_json FROM submissions "
             "WHERE status='needs_mapping' AND account_id=? AND batch_id=?",
             (acct, batch_id),
         ).fetchall()
     else:
-        # Canal API (batch_id IS NULL) + legacy (batch_id nesetat)
+        # POST /v1/mapari (save manual): re-rezolva EXCLUSIV canalul API (batch_id IS NULL).
+        # T7/R1 INCHIS: salvarea unei mapari NU re-queues randuri din batches de import
+        # (cross-batch / cross-feed). Batches de import sunt re-rezolvate doar la commit explicit.
         rows = conn.execute(
-            "SELECT id, payload_json FROM submissions WHERE status='needs_mapping' AND account_id=?",
+            "SELECT id, payload_json FROM submissions "
+            "WHERE status='needs_mapping' AND account_id=? AND batch_id IS NULL",
             (acct,),
         ).fetchall()