Refactor: implemented Repository Factory and Async Mutator Engine. Decoupled storage logic and enforced Dependency Injection across CLI and Web API. Updated documentation.

decnet/web/db/factory.py

@@ -0,0 +1,18 @@
+from typing import Any
+from decnet.env import os
+from decnet.web.db.repository import BaseRepository
+
+def get_repository(**kwargs: Any) -> BaseRepository:
+    """Factory function to instantiate the correct repository implementation based on environment."""
+    db_type = os.environ.get("DECNET_DB_TYPE", "sqlite").lower()
+
+    if db_type == "sqlite":
+        from decnet.web.db.sqlite.repository import SQLiteRepository
+        return SQLiteRepository(**kwargs)
+    elif db_type == "mysql":
+        # Placeholder for future implementation
+        # from decnet.web.db.mysql.repository import MySQLRepository
+        # return MySQLRepository()
+        raise NotImplementedError("MySQL support is planned but not yet implemented.")
+    else:
+        raise ValueError(f"Unsupported database type: {db_type}")