Revise Development-Workflow documentation and enhance backend deployment instructions

- Added critical warnings against compiling the Rust backend on macOS for deployment to Linux, detailing the reasons and potential errors.
- Updated deployment procedures for the backend to ensure builds are performed directly on the Linux dev server.
- Included new instructions for building container images with Docker/Podman and clarified frontend build processes.
- Enhanced the critical rules section to emphasize the importance of following deployment protocols to avoid system errors.

.cursor/rules/Development-Workflow.md

@@ -120,21 +120,40 @@ Creates a live system ISO (boots into a live environment, doesn't install).
 
 ## Deployment to Dev Server
 
-When making changes locally:
+### ⚠️ CRITICAL: Backend Compilation Architecture
 
-1. **Backend**:
+**NEVER compile the Rust backend on macOS and deploy to Linux!**
+
+The dev server (`192.168.1.228`) is **x86_64 Linux (Debian 12)**. Binaries compiled on macOS (even with cross-compilation) can cause "Exec format error" due to:
+- Different architecture (macOS ARM64/Intel vs Linux x86_64)
+- Different libc (macOS vs glibc)
+- Different system call interfaces
+
+**ALWAYS build the backend directly on the Linux dev server.**
+
+### Deployment Procedures
+
+1. **Backend** (MUST build on Linux):
    ```bash
-   # Build on remote server (Linux target)
+   # Option 1: SSH and build directly on server
    ssh archipelago@192.168.1.228
-   cd ~/archy/core
+   cd ~/archy/core/archipelago
+   source ~/.cargo/env  # Load Rust environment
    cargo build --release --bin archipelago
-   sudo cp target/release/archipelago /usr/local/bin/
+   sudo systemctl stop archipelago
-   sudo systemctl restart archipelago
+   sudo cp ../target/release/archipelago /usr/local/bin/
+   sudo systemctl start archipelago
+   
+   # Option 2: Update source and build remotely
+   # From local machine:
+   scp core/archipelago/src/**/*.rs archipelago@192.168.1.228:~/archy/core/archipelago/src/
+   ssh archipelago@192.168.1.228 'source ~/.cargo/env && cd ~/archy/core/archipelago && cargo build --release'
+   ssh archipelago@192.168.1.228 'sudo systemctl stop archipelago && sudo cp ~/archy/core/target/release/archipelago /usr/local/bin/ && sudo systemctl start archipelago'
    ```
 
-2. **Frontend**:
+2. **Frontend** (can build locally):
    ```bash
-   # Build locally (macOS)
+   # Build locally (macOS is fine for frontend)
    cd neode-ui
    npm run build
    
@@ -143,10 +162,24 @@ When making changes locally:
    ssh archipelago@192.168.1.228 'sudo rm -rf /opt/archipelago/web-ui/* && sudo cp -r /tmp/neode-ui-build/* /opt/archipelago/web-ui/ && sudo chown -R www-data:www-data /opt/archipelago/web-ui'
    ```
 
+3. **Container Images** (Docker/Podman):
+   ```bash
+   # Build locally and push to server
+   cd docker/<app-name>
+   podman build -t localhost/<app-name>:latest .
+   podman save localhost/<app-name>:latest | ssh archipelago@192.168.1.228 'podman load'
+   ```
+
 ## CRITICAL RULES
 
+### 🚨 NEVER VIOLATE THESE
+
 1. **ALWAYS deploy to the live development server (192.168.1.228)** for testing
-2. **NEVER build macOS binaries for Linux deployment** (backend must be built on Linux)
+2. **🔴 NEVER EVER compile the Rust backend on macOS and deploy to Linux** 
+   - Dev server is `x86_64 Linux (Debian 12)`
+   - Always build backend **ON the Linux server** using `source ~/.cargo/env && cargo build --release`
+   - macOS binaries will cause "Exec format error" and break the system
+   - Frontend (Vue.js) CAN be built on macOS - it's just HTML/CSS/JS
 3. **The ISO must capture the CURRENT STATE of the dev server**, not build from source
 4. **Frontend build output is in `web/dist/neode-ui/`**, NOT `neode-ui/dist/`
 5. **Nginx serves on port 80** and proxies backend on `localhost:5678`
@@ -177,9 +210,21 @@ After flashing ISO:
 - **Cause**: Using `build-debian-iso.sh` (live system) instead of `build-auto-installer-iso.sh`
 - **Fix**: Use correct auto-installer script
 
-**Issue**: macOS backend binary on Linux server
+**Issue**: macOS backend binary on Linux server ("Exec format error")
-- **Cause**: Building backend on macOS and copying to Linux
+- **Cause**: Compiling Rust backend on macOS and copying to Linux server
-- **Fix**: Always build backend on the Linux dev server
+- **Symptom**: `systemd` service fails with "status=203/EXEC" and "Failed to execute: Exec format error"
+- **Why it happens**: Different architectures and system ABIs between macOS and Linux
+- **Fix**: **ALWAYS build the backend ON the Linux server**:
+  ```bash
+  ssh archipelago@192.168.1.228
+  cd ~/archy/core/archipelago
+  source ~/.cargo/env
+  cargo build --release
+  sudo systemctl stop archipelago
+  sudo cp ../target/release/archipelago /usr/local/bin/
+  sudo systemctl start archipelago
+  ```
+- **Prevention**: Never use local `cargo build` for deployment - always build on target system
 
 **Issue**: Frontend not updating on server
 - **Cause**: Building to wrong output directory or not deploying to correct Nginx root

core/archipelago/src/container/docker_packages.rs

@@ -100,6 +100,10 @@ impl DockerPackageScanner {
                 // Bitcoin UI runs on host network at port 8334
                 debug!("Using bitcoin-ui for bitcoin-knots: http://localhost:8334");
                 Some("http://localhost:8334".to_string())
+            } else if app_id == "lnd" {
+                // LND UI runs on host network at port 8081
+                debug!("Using lnd-ui for lnd: http://localhost:8081");
+                Some("http://localhost:8081".to_string())
             } else if app_id == "tailscale" {
                 // Tailscale uses host networking, so no port mappings
                 // But web UI is always on port 8240

neode-ui/src/api/container-client.ts

@@ -10,6 +10,7 @@ export interface ContainerStatus {
   image: string
   created: string
   ports: string[]
+  lan_address?: string // Launch URL for the app's UI
 }
 
 export interface ContainerAppInfo {

neode-ui/src/stores/container.ts

@@ -13,6 +13,7 @@ export interface BundledApp {
   ports: { host: number; container: number }[]
   volumes: { host: string; container: string }[]
   category: 'bitcoin' | 'lightning' | 'home' | 'other'
+  lan_address?: string // Runtime launch URL from backend
 }
 
 export const BUNDLED_APPS: BundledApp[] = [