Align documentation and Docker configuration with current implementation

- Fix README.md: Make Docker deployment recommended, remove duplicate installation section
- Fix Dockerfile: Copy correct source files (unraid_mcp/, uv.lock, README.md) instead of non-existent unraid_mcp_server.py
- Update docker-compose.yml: Enable build configuration and use .env instead of .env.local
- Add missing environment variables to .env.example and .env: UNRAID_AUTO_START_SUBSCRIPTIONS, UNRAID_MAX_RECONNECT_ATTEMPTS
- Fix CLAUDE.md: Correct environment hierarchy documentation (../env.local → ../.env.local)
- Remove unused unraid-schema.json file

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Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -98,7 +98,7 @@ docker-compose down
 ### Environment Variable Hierarchy
 The server loads environment variables from multiple locations in order:
 1. `/app/.env.local` (container mount)
-2. `../env.local` (project root)
+2. `../.env.local` (project root)
 3. `../.env` (project root)
 4. `.env` (local directory)