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/integration/test_int_db_connectivity.py

@@ -0,0 +1,46 @@
+import sqlalchemy
+from sqlalchemy import text
+import json
+
+# Connection details from .env
+DB_USER = "aether_dev"
+DB_PASS = "$1sky.AE_dev.2023"
+DB_SERVER = "vpn-db.oneskyit.com"
+DB_PORT = "3306"
+DB_NAME = "aether_dev"
+
+# Construct URI
+DB_URI = f"mysql://{DB_USER}:{DB_PASS}@{DB_SERVER}:{DB_PORT}/{DB_NAME}"
+
+def test_raw_describe():
+    engine = sqlalchemy.create_engine(DB_URI)
+    print(f"Connecting to {DB_SERVER}...")
+    
+    try:
+        with engine.connect() as conn:
+            result = conn.execute(text("DESCRIBE journal"))
+            columns = []
+            for row in result.fetchall():
+                columns.append({
+                    "Field": row[0],
+                    "Type": row[1],
+                    "Null": row[2],
+                    "Default": row[4]
+                })
+            
+            # Print as a nice JSON snippet
+            print("\n--- Raw DB Metadata for 'journal' (Sample) ---")
+            print(json.dumps(columns[:5], indent=2))
+            
+            # Highlight the specific fields mentioned in the task
+            print("\n--- Target Fields ---")
+            targets = ["name", "enable", "passcode_timeout", "created_on"]
+            for col in columns:
+                if col["Field"] in targets:
+                    print(f"Field: {col['Field']:16} | Type: {col['Type']:15} | Null: {col['Null']:3} | Default: {col['Default']}")
+
+    except Exception as e:
+        print(f"Error: {e}")
+
+if __name__ == "__main__":
+    test_raw_describe()