feat: add Fast Note Sync Service with configuration, documentation, and logo

apps/fast-note-sync-service/README_en.md

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+# Fast Note Sync Service
+
+Fast Note Sync Service is a high-performance, low-latency note synchronization, online management, and REST API service platform for Obsidian, built with Go, WebSocket, and React.
+
+## Features
+
+- Sync Obsidian notes, folders, configuration, and attachments
+- Web administration panel for users, vaults, and note browsing
+- REST API, MCP, sharing, history, trash, and multi-storage backup support
+- Configurable SQLite, MySQL, and PostgreSQL database support
+
+## Usage
+
+### Default Port
+
+- Web admin panel / API / WebSocket: 9000
+
+### Initial Account
+
+- Open `http://SERVER_IP:9000` and register the first account
+- To disable public registration, set `user.register-is-enable: false` in the configuration file
+
+### Data Directories
+
+- Notes and attachments: `./data/storage`
+- Configuration files: `./data/config`
+
+### Client Setup
+
+Log in to the web admin panel, click "Copy API Configuration", and paste it into the Obsidian Fast Note Sync plugin settings.
+
+## Links
+
+- GitHub: https://github.com/haierkeys/fast-note-sync-service
+- Obsidian plugin: https://github.com/haierkeys/obsidian-fast-note-sync
+- REST API docs: https://github.com/haierkeys/fast-note-sync-service/blob/master/docs/REST_API.md