Initial release: procd service and LuCI app for copyparty

OpenWrt procd service script and LuCI JavaScript interface for
copyparty (https://github.com/9001/copyparty), a self-hosted file
sharing server.

Features:
- procd service with UCI-driven volumes, accounts, and TLS cert
- LuCI view: settings, volume/account grids, live status + start/stop
- ACME TLS support via combined key+fullchain PEM (--cert flag)
- Auto-respawn and reload-on-config-change via service_triggers

README.md

@@ -0,0 +1,80 @@
+# luci-app-copyparty
+
+OpenWrt procd service and LuCI interface for [copyparty](https://github.com/9001/copyparty), a self-hosted file sharing server.
+
+## Requirements
+
+- OpenWrt 23.05 or later (uses LuCI JavaScript views)
+- `python3` package installed
+- copyparty single-file bundle (e.g. `copyparty-en.py`) downloaded separately from the [copyparty releases page](https://github.com/9001/copyparty/releases)
+
+## Installation
+
+```sh
+# On the OpenWrt device:
+sh install.sh
+```
+
+Or copy files manually to their destinations (see `install.sh` for the mapping).
+
+The UCI config file (`/etc/config/copyparty`) is **not overwritten** if it already exists, so re-running install is safe.
+
+## Configuration
+
+Edit `/etc/config/copyparty`:
+
+```
+config copyparty 'config'
+    option enabled '1'
+    option port '3923'
+    option name 'MyNAS'
+    option script '/path/to/copyparty-en.py'
+    option usernames '0'      # set to 1 to require username+password
+
+config volume
+    option src '/mnt/raid/files'
+    option dst '/files'
+    option flags 'r'          # r=read, w=write, m=move, d=delete, g=get
+
+config account
+    option user 'alice'
+    option pass 'secret'
+```
+
+Or configure via **LuCI → Services → Copyparty**.
+
+## Volume flags
+
+| Flag | Meaning |
+|---|---|
+| `r` | Read / browse (anonymous) |
+| `w` | Write / upload |
+| `m` | Move / rename |
+| `d` | Delete |
+| `g` | Download as file (bypasses browser preview) |
+
+Common combinations: `r` (read-only), `rw` (read/write), `rwmd` (full access).
+
+See the [copyparty docs](https://github.com/9001/copyparty#accounts-and-volumes) for the full flag reference.
+
+## Service management
+
+```sh
+/etc/init.d/copyparty enable   # start on boot
+/etc/init.d/copyparty start
+/etc/init.d/copyparty stop
+/etc/init.d/copyparty restart
+```
+
+## File layout
+
+```
+etc/
+  config/copyparty                          UCI config
+  init.d/copyparty                          procd service script
+usr/share/
+  luci/menu.d/luci-app-copyparty.json       LuCI menu entry
+  rpcd/acl.d/luci-app-copyparty.json        rpcd ACL
+www/luci-static/resources/view/
+  copyparty.js                              LuCI JavaScript view
+```