feat: proxy routes page, OIDC login fix, NPM test connection, webhook URL fix, and UX improvements

- Add /proxies page showing deploy-managed proxy routes with project/stage links, search, and status
- Add GET /api/proxies endpoint joining instances with project/stage names
- Add POST /api/settings/npm/test endpoint for NPM connection validation
- Add GET /api/auth/mode public endpoint for auth mode detection
- Add NPM Test Connection button with validation on save
- Fix OIDC SSO button only shown when auth_mode is oidc
- Fix webhook URL showing empty when domain not set (fallback to request host)
- Fix quick deploy double-tag (image:latest:latest) by splitting tag from image URL
- Fix trim() errors on number inputs in deploy and settings forms
- Fix NPM client auto-append /api to base URL
- Sanitize NPM test error messages (no raw HTML)
- Remove healthcheck field from Quick Deploy form
- Fix env vars placeholder newline
- Make domain field optional in settings
- Set polling interval minimum to 60s
- Add Proxies and Events to sidebar navigation
- Fix SSL cert name flash on NPM settings page
- Fix empty state icon on proxies page

internal/api/deploys.go

@@ -116,11 +116,20 @@ func (s *Server) quickDeploy(w http.ResponseWriter, r *http.Request) {
 		respondError(w, http.StatusBadRequest, "image is required")
 		return
 	}
+
+	// Split tag from image if the image URL contains one (e.g., "registry/app:v1").
 	if req.Tag == "" {
-		req.Tag = "latest"
+		imageRef, tag := splitImageTag(req.Image)
+		if tag != "" {
+			req.Image = imageRef
+			req.Tag = tag
+		} else {
+			req.Tag = "latest"
+		}
 	}
+
 	if req.Name == "" {
-		// Derive name from image.
+		// Derive name from image (without tag).
 		parts := strings.Split(req.Image, "/")
 		req.Name = parts[len(parts)-1]
 	}