Add comprehensive documentation for MasterHttpRelayVPN

- Introduced ARCHITECTURE.md to outline the system architecture and flow.
- Created CONFIGURATION.md detailing configuration options and their meanings.
- Added DOCKER.md for Docker setup instructions and usage.
- Developed GETTING_STARTED.md to guide users through initial setup and usage.
- Included LAN_SHARING.md to explain how to enable LAN sharing for the proxy.
- Established SECURITY.md to highlight security practices and responsibilities.
- Compiled TROUBLESHOOTING.md to assist users in resolving common issues.
- Translated documentation into Persian, including ARCHITECTURE.md and CONFIGURATION.md.

docs/LAN_SHARING.md

@@ -0,0 +1,41 @@
+# LAN Sharing
+
+By default, MasterHttpRelayVPN listens only on `127.0.0.1`, so only the same computer can use it. LAN sharing lets phones, tablets, or other computers on your local network use your proxy.
+
+## When To Use It
+
+Use LAN sharing only on a trusted private network. Anyone who can reach the proxy can send traffic through it.
+
+## Enable LAN Sharing
+
+Set this in `config.json`:
+
+```json
+{
+  "lan_sharing": true,
+  "listen_host": "0.0.0.0",
+  "http_port": 8085
+}
+```
+
+Restart the proxy. The startup log prints LAN addresses other devices can use.
+
+## Configure Other Devices
+
+On the other device, set the HTTP proxy to:
+
+| Field | Value |
+|-------|-------|
+| Address | Your computer's LAN IP from the startup log |
+| Port | `8085` |
+| Type | HTTP |
+
+If the other device browses HTTPS websites, it also needs to trust the CA certificate from `ca/ca.crt`.
+
+## Safety Checklist
+
+- Use this only on networks you trust.
+- Turn it off when you do not need it.
+- Keep `auth_key` private.
+- Never share the `ca/` folder.
+- Prefer `127.0.0.1` for normal single-computer use.