fix: correct webhook icon URLs and add release notes

- Fix Discord webhook templates to use logo.svg instead of non-existent favicon.svg
- Add comprehensive release notes for v4.3.0 about embedded frontend breaking change
- Document migration path and benefits of embedded frontend

The embedded frontend is a significant architectural improvement that eliminates
path-related issues but requires clear communication to users about the change.

RELEASE_NOTES_v4.3.0.md

@@ -0,0 +1,42 @@
+# Pulse v4.3.0 Release Notes
+
+## ⚠️ BREAKING CHANGES
+
+### Frontend Now Embedded in Binary
+Starting with v4.3.0, the frontend is embedded directly in the Pulse binary. This is a significant architectural change that simplifies deployment but has some implications:
+
+**What Changed:**
+- Frontend files are now compiled into the Go binary at build time
+- No separate `frontend-modern/` directory needed
+- Single binary deployment - truly portable
+- Smaller release tarballs
+
+**Migration Notes:**
+- **For manual installations**: Simply replace your binary. The old `frontend-modern/` directory can be deleted
+- **For Docker users**: No changes needed, containers will work as normal
+- **For developers**: Frontend changes now require recompiling the Go binary (use `scripts/rebuild-frontend.sh`)
+- **Auto-updates**: Will work seamlessly from v4.2.1 to v4.3.0+
+
+**Benefits:**
+- Eliminates redirect loop issues (#304)
+- No more path resolution problems
+- Simpler installation and deployment
+- Consistent behavior across all installation methods
+- Reduced deployment size
+
+## Features
+- Embedded frontend for simplified single-binary deployment
+- Improved installation experience
+
+## Bug Fixes
+- Fixed redirect loops in various installation scenarios (#304)
+- Fixed path resolution issues with community scripts vs manual installs
+
+## Technical Details
+The frontend is embedded using Go's `embed` package. During the build process:
+1. Frontend is built with npm
+2. Built files are copied to `internal/api/frontend-modern/`
+3. Go compiler embeds these files into the binary
+4. Runtime serves embedded files directly from memory
+
+This change makes Pulse a true single-binary application, eliminating an entire class of deployment issues.

internal/notifications/webhook_templates.go

@@ -22,7 +22,7 @@ func GetWebhookTemplates() []WebhookTemplate {
 			Headers:    map[string]string{"Content-Type": "application/json"},
 			PayloadTemplate: `{
 				"username": "Pulse Monitoring",
-				"avatar_url": "https://raw.githubusercontent.com/rcourtman/Pulse/main/frontend-modern/public/favicon.svg",
+				"avatar_url": "https://raw.githubusercontent.com/rcourtman/Pulse/main/frontend-modern/public/logo.svg",
 				"embeds": [{
 					"title": "Pulse Alert: {{.Level | title}}",
 					"description": "{{.Message}}",
@@ -39,7 +39,7 @@ func GetWebhookTemplates() []WebhookTemplate {
 					"timestamp": "{{.Timestamp}}",
 					"footer": {
 						"text": "Pulse Monitoring",
-						"icon_url": "https://raw.githubusercontent.com/rcourtman/Pulse/main/frontend-modern/public/favicon.svg"
+						"icon_url": "https://raw.githubusercontent.com/rcourtman/Pulse/main/frontend-modern/public/logo.svg"
 					}
 				}]
 			}`,