Docs: Consolidate admin documentation and migrate reference data

- Created LOCAL_DEVELOPMENT_GUIDE.md and DEPLOYMENT_GUIDE_MANUAL.md from legacy txt files.
- Migrated country/time_zone data and requirements.txt to documentation/reference_data/.
- Removed redundant admin/documentation/ and admin/data_files/ directories.
- Enhanced app/lib_schema_v3.py to explicitly capture 'required' fields from DB 'NOT NULL' constraint.
- Added verification tests for schema logic and standalone DB connectivity.

app/lib_schema_v3.py

@@ -38,9 +38,15 @@ def get_object_schema_info(obj_type: str, view: str = 'default', variant: str =
     try:
         db_result = db.execute(text(f"DESCRIBE `{table_name}`"))
         for row in db_result.fetchall():
+            # row format: (Field, Type, Null, Key, Default, Extra)
             schema_info["database"]["columns"].append({
-                "field": row[0], "type": row[1], "nullable": row[2] == 'YES',
-                "key": row[3], "default": row[4], "extra": row[5]
+                "field": row[0], 
+                "db_type": row[1], 
+                "nullable": row[2] == 'YES',
+                "required": row[2] == 'NO', # Explicitly capture NOT NULL
+                "key": row[3], 
+                "db_default": row[4], 
+                "extra": row[5]
             })
     except Exception as e:
         schema_info["database"]["error"] = str(e)