luci-app-ha-cluster: add LuCI interface

applications/luci-app-ha-cluster/Makefile

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+# SPDX-License-Identifier: Apache-2.0
+
+include $(TOPDIR)/rules.mk
+
+PKG_LICENSE:=Apache-2.0
+PKG_MAINTAINER:=Pierre Gaufillet <pierre.gaufillet@bergamote.eu>
+
+LUCI_TITLE:=LuCI support for HA Cluster
+LUCI_DEPENDS:=+ha-cluster +luci-base +rpcd
+
+include ../../luci.mk
+
+# call BuildPackage - OpenWrt buildroot signature

applications/luci-app-ha-cluster/README.md

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+# LuCI Application for HA Cluster
+
+Web interface for managing High Availability clusters on OpenWrt.
+
+## Features
+
+### General Tab
+- Simple multi-router HA configuration (2 or more nodes)
+- Priority configuration
+- Peer router management
+- VRRP instance management (VIPs grouped by instance fail over atomically)
+- Virtual IP (VIP) configuration per interface with instance selector
+- Inline VRRP instance creation from VIP modal ("Add new..." option)
+- Service synchronization selection
+- One-click enable/disable
+
+### Status Tab
+- Real-time cluster state (MASTER/BACKUP/FAULT)
+- Peer connectivity status
+- Service health monitoring (keepalived, owsync, lease-sync)
+- DHCP lease sync statistics
+- Config sync statistics
+- Auto-refresh every 5 seconds
+
+### Advanced Pages
+- **Keepalived (Advanced)**: VRRP instance tuning (timing/auth/tracking/unicast) and health checks
+- **owsync (Advanced)**: Custom sync groups, exclusions, poll interval
+- **DHCP Sync (Advanced)**: lease-sync tuning and logging
+
+## Installation
+
+```bash
+apk update
+apk add luci-app-ha-cluster
+```
+
+## Dependencies
+
+- `ha-cluster` - HA cluster management package
+- `luci-base` - LuCI base system
+- `rpcd` - RPC daemon
+
+## Files
+
+```
+/www/luci-static/resources/
+└── view/ha-cluster/
+    ├── simple.js              # General interface
+    ├── status.js              # Status dashboard
+    ├── keepalived-advanced.js # Advanced VRRP settings
+    ├── owsync-advanced.js     # Advanced config sync settings
+    └── lease-sync-advanced.js # Advanced DHCP sync settings
+
+/usr/share/luci/menu.d/
+└── luci-app-ha-cluster.json   # Menu definition
+
+/usr/share/rpcd/acl.d/
+└── luci-app-ha-cluster.json   # Access control
+
+/usr/libexec/rpcd/
+└── ha-cluster                 # RPC backend (shell script)
+```
+
+## Usage
+
+1. Navigate to **Services → High Availability** in LuCI
+2. Go to **General** tab
+3. Configure:
+   - Enable HA Cluster
+   - Set priority
+   - Add peer router IP
+   - Configure Virtual IPs for each interface
+   - Select services to synchronize
+4. Save & Apply
+
+## Screenshots
+
+### General
+Simple form-based configuration for typical multi-router setups:
+- Cluster settings (priority, VRRP transport)
+- Peer configuration
+- Virtual IP addresses
+- Service sync options
+
+### Status Dashboard
+Real-time monitoring with:
+- Cluster state indicator (color-coded)
+- Peer health status
+- Service status table
+- Sync statistics
+
+## Development
+
+### Testing Locally
+
+```bash
+# Build the package
+make package/luci-app-ha-cluster/compile
+
+# Install on router
+scp bin/packages/*/luci/luci-app-ha-cluster_*.apk root@router:/tmp/
+ssh root@router apk add /tmp/luci-app-ha-cluster_*.apk
+
+# Clear LuCI cache
+ssh root@router rm -rf /tmp/luci-*
+```
+
+### Debugging
+
+Enable debug mode in browser console:
+```javascript
+L.env.sessionid
+```
+
+Check RPC calls:
+```bash
+ubus call ha-cluster status
+```
+
+View logs:
+```bash
+logread | grep luci
+logread | grep ha-cluster
+```
+
+## License
+
+Apache-2.0
+
+luci-app-ha-cluster has been developed using Claude Code from Anthropic.
+
+## Maintainer
+
+Pierre Gaufillet <pierre.gaufillet@bergamote.eu>