Move blockchain app READMEs to centralized documentation

- Relocate blockchain-event-bridge README content to docs/apps/blockchain/blockchain-event-bridge.md
- Relocate blockchain-explorer README content to docs/apps/blockchain/blockchain-explorer.md
- Replace app READMEs with redirect notices pointing to new documentation location
- Consolidate documentation in central docs/ directory for better organization

apps/wallet/README.md

@@ -1,32 +1,9 @@
-# Wallet Daemon
+# Wallet
 
-## Purpose & Scope
+**Documentation has moved to:** [docs/apps/wallet/wallet.md](../../docs/apps/wallet/wallet.md)
 
-Local FastAPI service that manages encrypted keys, signs transactions/receipts, and exposes wallet RPC endpoints. Reference `docs/bootstrap/wallet_daemon.md` for the implementation plan.
+---
 
-## Development Setup
+This file has been migrated to the central documentation location. Please update your bookmarks and references to point to the new location.
 
-- Create a Python virtual environment under `apps/wallet-daemon/.venv` or use Poetry.
-- Install dependencies via Poetry (preferred):
-  ```bash
-  poetry install
-  ```
-- Copy/create `.env` and configure coordinator access:
-  ```bash
-  cp .env.example .env  # create file if missing
-  ```
-  - `COORDINATOR_BASE_URL` (default `http://localhost:8011`)
-  - `COORDINATOR_API_KEY` (development key to verify receipts)
-- Run the service locally:
-  ```bash
-  poetry run uvicorn app.main:app --host 127.0.0.2 --port 8071 --reload
-  ```
-- REST receipt endpoints:
-  - `GET /v1/receipts/{job_id}` (latest receipt + signature validations)
-  - `GET /v1/receipts/{job_id}/history` (full history + validations)
-- JSON-RPC interface (`POST /rpc`):
-  - Method `receipts.verify_latest`
-  - Method `receipts.verify_history`
-- Keystore scaffolding:
-  - `KeystoreService` uses Argon2id + XChaCha20-Poly1305 via `app/crypto/encryption.py` (in-memory for now).
-  - Future milestones will add persistent storage and wallet lifecycle routes.
+For the complete documentation, see the [Wallet documentation](../../docs/apps/wallet/wallet.md).