Fix brew service to use app bundle path directly

The symlink in /usr/local/bin causes Bundle.main.bundleIdentifier
to be nil. Using the direct path to the .app bundle fixes this.

Also added update instructions to README.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: laurentftech

.github/workflows/release.yml

@@ -92,7 +92,7 @@ jobs:
             end
           
             service do
-              run [opt_bin/"ntfy-macos", "serve"]
+              run [opt_prefix/"ntfy-macos.app/Contents/MacOS/ntfy-macos", "serve"]
               keep_alive true
               log_path var/"log/ntfy-macos/stdout.log"
               error_log_path var/"log/ntfy-macos/stderr.log"

README.md

@@ -44,6 +44,16 @@ swift build -c release
 sudo cp .build/release/ntfy-macos /usr/local/bin/
 ```
 
+### Updating
+
+```bash
+# Update via Homebrew
+brew update && brew upgrade ntfy-macos
+
+# Restart the service to apply the update
+brew services restart ntfy-macos
+```
+
 ## Quick Start
 
 1. **Initialize Configuration**