Instalar msodbcsql18 y auto-detectar driver de SQL Server en Linux/Windows

backend/data_manager_v2.py

@@ -138,12 +138,26 @@ class DataManager:
 
     def sql_conn(self):
         import pyodbc
+        driver = os.getenv("SQL_DRIVER")
+        if not driver:
+            installed = pyodbc.drivers()
+            if "ODBC Driver 18 for SQL Server" in installed:
+                driver = "ODBC Driver 18 for SQL Server"
+            elif "ODBC Driver 17 for SQL Server" in installed:
+                driver = "ODBC Driver 17 for SQL Server"
+            elif "FreeTDS" in installed:
+                driver = "FreeTDS"
+            else:
+                driver = "SQL Server"
+
         conn_str = (
-            f"DRIVER={{SQL Server}};SERVER={self.sql_server};"
-            f"DATABASE={self.sql_db};UID={self.sql_user};PWD={self.sql_pass}"
+            f"DRIVER={{{driver}}};SERVER={self.sql_server};"
+            f"DATABASE={self.sql_db};UID={self.sql_user};PWD={self.sql_pass};"
+            "Encrypt=no;TrustServerCertificate=yes;"
         )
         return pyodbc.connect(conn_str)
 
+
     # ── CHATWOOT: leads de pauta (mapa de campañas, dedup por mensaje) ──
     def traer_leads_chatwoot(self):
         sql = f"""