Tests: Reorganize test suite into functional subdirectories

- Categorized scripts into tests/unit/, tests/integration/, tests/e2e/, and tests/tools/.
- Adopted consistent naming prefixes (test_unit_*, test_int_*, test_e2e_*, tool_*).
- Renamed conftest_mock.py to mock_config_helper.py for clarity.
- Updated test_int_boot_diagnosis.py with sys.path setup for root-level execution.

tests/archive/check_db_schema.py

@@ -0,0 +1,13 @@
+from app.db_sql import db
+from sqlalchemy import text
+
+def check_columns():
+    try:
+        result = db.execute(text("DESCRIBE account"))
+        columns = [row[0] for row in result.fetchall()]
+        print(f"Columns in 'account': {columns}")
+    except Exception as e:
+        print(f"Error describing 'account': {e}")
+
+if __name__ == "__main__":
+    check_columns()

tests/archive/check_site_schema.py

@@ -0,0 +1,19 @@
+from app.db_sql import db
+from sqlalchemy import text
+
+def check_schema(name):
+    print(f"--- Schema for {name} ---")
+    try:
+        result = db.execute(text(f"DESCRIBE `{name}`"))
+        for row in result.fetchall():
+            print(f"  {row[0]} ({row[1]})")
+    except Exception as e:
+        print(f"  Error: {e}")
+    print("-" * 30)
+
+if __name__ == "__main__":
+    # Check tables
+    check_schema("site")
+    check_schema("site_domain")
+    # Check views used in CRUD V3
+    check_schema("v_site_domain")