refactor: update database schema and fix chain_id handling across components

- Add new Transaction fields: nonce, value, fee, status, timestamp, tx_metadata
- Add block_metadata field to Block model
- Remove account_type and metadata fields from Account creation
- Simplify contract deployment transaction structure
- Fix chain_id hardcoding in PoA proposer and RPC router
- Update config to use /opt/aitbc/.env path with extra="ignore"
- Switch from starlette.broadcast to broadcaster module
- Update CLI

apps/blockchain-node/fix_db.py

@@ -0,0 +1,40 @@
+from aitbc_chain.database import engine, init_db
+from sqlalchemy import text
+
+def fix():
+    init_db()
+    with engine.connect() as conn:
+        try:
+            conn.execute(text('ALTER TABLE "transaction" ADD COLUMN metadata TEXT'))
+            print("Added metadata")
+        except Exception as e:
+            pass
+        try:
+            conn.execute(text('ALTER TABLE "transaction" ADD COLUMN value INTEGER DEFAULT 0'))
+            print("Added value")
+        except Exception as e:
+            pass
+        try:
+            conn.execute(text('ALTER TABLE "transaction" ADD COLUMN fee INTEGER DEFAULT 0'))
+            print("Added fee")
+        except Exception as e:
+            pass
+        try:
+            conn.execute(text('ALTER TABLE "transaction" ADD COLUMN nonce INTEGER DEFAULT 0'))
+            print("Added nonce")
+        except Exception as e:
+            pass
+        try:
+            conn.execute(text('ALTER TABLE "transaction" ADD COLUMN status TEXT DEFAULT "pending"'))
+            print("Added status")
+        except Exception as e:
+            pass
+        try:
+            conn.execute(text('ALTER TABLE "transaction" ADD COLUMN timestamp TEXT'))
+            print("Added timestamp")
+        except Exception as e:
+            pass
+        conn.commit()
+
+if __name__ == "__main__":
+    fix()