feat(dev_tools): expand SQL query tool presets and fix column headers

Add 45 new preset queries covering all database tables, reorganize into
platform-aligned sections (Infrastructure, Core, OMS, Loyalty, Hosting,
Internal) with search/filter input. Fix column headers not appearing on
SELECT * queries by capturing result.keys() before fetchmany().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/dev_tools/services/sql_query_service.py

@@ -99,10 +99,9 @@ def execute_query(db: Session, sql: str) -> dict:
 
         start = time.perf_counter()
         result = connection.execute(text(sql))
+        columns = list(result.keys()) if result.returns_rows else []
         rows_raw = result.fetchmany(max_rows + 1)
         elapsed_ms = round((time.perf_counter() - start) * 1000, 2)
-
-        columns = list(result.keys()) if result.returns_rows else []
         truncated = len(rows_raw) > max_rows
         rows_raw = rows_raw[:max_rows]