refactor: consolidate blockchain explorer into single app and update backup ignore patterns

- Remove standalone explorer-web app (README, HTML, package files)
- Add /web endpoint to blockchain-explorer for web interface access
- Update .gitignore to exclude application backup archives (*.tar.gz, *.zip)
- Add backup documentation files to .gitignore (BACKUP_INDEX.md, README.md)
- Consolidate explorer functionality into main blockchain-explorer application

apps/wallet/src/app/deps.py

@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+from functools import lru_cache
+
+from fastapi import Depends
+
+from .keystore.service import KeystoreService
+from .ledger_mock import SQLiteLedgerAdapter
+from .keystore.persistent_service import PersistentKeystoreService
+from .receipts.service import ReceiptVerifierService
+from .settings import Settings, settings
+# Temporarily disable multi-chain imports to test basic functionality
+# from .chain.manager import ChainManager, chain_manager
+# from .chain.multichain_ledger import MultiChainLedgerAdapter
+# from .chain.chain_aware_wallet_service import ChainAwareWalletService
+
+
+def get_settings() -> Settings:
+    return settings
+
+
+def get_receipt_service(config: Settings = Depends(get_settings)) -> ReceiptVerifierService:
+    return ReceiptVerifierService(
+        coordinator_url=config.coordinator_base_url,
+        api_key=config.coordinator_api_key,
+    )
+
+
+@lru_cache
+def get_keystore(config: Settings = Depends(get_settings)) -> PersistentKeystoreService:
+    return PersistentKeystoreService(db_path=config.ledger_db_path.parent / "keystore.db")
+
+
+def get_ledger(config: Settings = Depends(get_settings)) -> SQLiteLedgerAdapter:
+    return SQLiteLedgerAdapter(config.ledger_db_path)
+
+# Temporarily disable multi-chain dependency functions
+# @lru_cache
+# def get_chain_manager() -> ChainManager:
+#     return chain_manager
+
+# @lru_cache
+# def get_multichain_ledger(chain_mgr: ChainManager = Depends(get_chain_manager)) -> MultiChainLedgerAdapter:
+#     return MultiChainLedgerAdapter(chain_mgr)
+
+# @lru_cache
+# def get_chain_aware_wallet_service(
+#     chain_mgr: ChainManager = Depends(get_chain_manager),
+#     multichain_ledger: MultiChainLedgerAdapter = Depends(get_multichain_ledger)
+# ) -> ChainAwareWalletService:
+#     return ChainAwareWalletService(chain_mgr, multichain_ledger)