Initial commit: SMS Receiver Web Service

Features:
- Receive SMS from TranspondSms Android APP
- HMAC-SHA256 signature verification (optional)
- SQLite database storage
- Web UI with login authentication
- Multiple API tokens support
- Timezone conversion (Asia/Shanghai)
- Search, filter, and statistics
- Auto refresh and session management

Tech Stack:
- Flask 3.0
- SQLite database
- HTML5/CSS3 responsive design

.gitignore

@@ -0,0 +1,47 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+env/
+ENV/
+*.egg-info/
+.eggs/
+dist/
+build/
+
+# SQLite
+*.db
+*.db-shm
+*.db-wal
+
+# 日志
+*.log
+logs/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# 环境
+.env
+.env.local
+
+# Flask
+instance/
+
+# 临时文件
+*.tmp
+*.bak
+.DS_Store
+
+# 进程ID
+*.pid
+
+# 编辑器备份
+*~