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

config.json

@@ -0,0 +1,37 @@
+{
+  "app": {
+    "name": "短信转发接收端",
+    "version": "1.0.0"
+  },
+  "server": {
+    "host": "0.0.0.0",
+    "port": 9518,
+    "debug": true
+  },
+  "security": {
+    "enabled": true,
+    "username": "admin",
+    "password": "admin123",
+    "session_lifetime": 3600,
+    "secret_key": "default_secret_key_change_me",
+    "sign_verify": true,
+    "sign_max_age": 3600000
+  },
+  "sms": {
+    "max_messages": 10000,
+    "auto_cleanup": true,
+    "cleanup_days": 30
+  },
+  "database": {
+    "path": "sms_receiver.db"
+  },
+  "timezone": "Asia/Shanghai",
+  "api_tokens": [
+    {
+      "name": "默认配置",
+      "token": "default_token",
+      "secret": "",
+      "enabled": true
+    }
+  ]
+}