v0.3.0: structural refactor — go:embed templates, server split, domain rename

- Migrate all 7 HTML templates + CSS from Go string constants to individual
  go:embed files in internal/web/templates/ (templates.go: 2150→35 lines)
- Split server.go into auth.go, handlers.go, funcmap.go (server.go: 540→120 lines)
- Rename controller subdomain from dashboard.* to felhom.* in Traefik labels
- Update documentation (CLAUDE.md, README.md, CONTEXT.md)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/web/funcmap.go

@@ -0,0 +1,133 @@
+package web
+
+import (
+	"fmt"
+	"html/template"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/stacks"
+)
+
+// templateFuncMap returns the FuncMap used by all HTML templates.
+func (s *Server) templateFuncMap() template.FuncMap {
+	return template.FuncMap{
+		"stateColor": func(state stacks.ContainerState) string {
+			switch state {
+			case stacks.StateRunning:
+				return "green"
+			case stacks.StateStarting:
+				return "orange"
+			case stacks.StateUnhealthy:
+				return "yellow"
+			case stacks.StateStopped, stacks.StateExited:
+				return "red"
+			case stacks.StateRestarting:
+				return "yellow"
+			default:
+				return "gray"
+			}
+		},
+		"stateLabel": func(state stacks.ContainerState) string {
+			switch state {
+			case stacks.StateRunning:
+				return "Fut"
+			case stacks.StateStarting:
+				return "Indulás..."
+			case stacks.StateUnhealthy:
+				return "Nem egészséges"
+			case stacks.StateStopped, stacks.StateExited:
+				return "Leállítva"
+			case stacks.StateRestarting:
+				return "Újraindítás..."
+			case stacks.StateNotDeployed:
+				return "Nincs telepítve"
+			case stacks.StatePaused:
+				return "Szüneteltetve"
+			default:
+				return "Ismeretlen"
+			}
+		},
+		"stateIcon": func(state stacks.ContainerState) string {
+			switch state {
+			case stacks.StateRunning:
+				return "●"
+			case stacks.StateStarting:
+				return "◐"
+			case stacks.StateUnhealthy:
+				return "◑"
+			case stacks.StateStopped, stacks.StateExited:
+				return "○"
+			case stacks.StateRestarting:
+				return "◐"
+			default:
+				return "◌"
+			}
+		},
+		"stateStr": func(state stacks.ContainerState) string {
+			return string(state)
+		},
+		// isOperational returns true for any state where the stack has containers
+		// and is not stopped/exited — used by templates for showing action buttons
+		"isOperational": func(state stacks.ContainerState) bool {
+			switch state {
+			case stacks.StateRunning, stacks.StateStarting, stacks.StateUnhealthy, stacks.StateRestarting:
+				return true
+			default:
+				return false
+			}
+		},
+		"logoURL": func(slug string) string {
+			return s.cfg.AppLogoURL(slug)
+		},
+		"logoPNGURL": func(slug string) string {
+			return s.cfg.AppLogoPNGURL(slug)
+		},
+		"appPageURL": func(slug string) string {
+			return s.cfg.AppPageURL(slug)
+		},
+		"usageColor": func(percent float64) string {
+			if percent >= 85 {
+				return "red"
+			}
+			if percent >= 70 {
+				return "yellow"
+			}
+			return "green"
+		},
+		"fmtMB": func(mb uint64) string {
+			if mb >= 1024 {
+				gb := float64(mb) / 1024.0
+				if gb >= 10 {
+					return fmt.Sprintf("%.0f GB", gb)
+				}
+				return fmt.Sprintf("%.1f GB", gb)
+			}
+			return fmt.Sprintf("%d MB", mb)
+		},
+		"fmtGB": func(gb float64) string {
+			if gb >= 100 {
+				return fmt.Sprintf("%.0f GB", gb)
+			}
+			if gb >= 10 {
+				return fmt.Sprintf("%.1f GB", gb)
+			}
+			return fmt.Sprintf("%.2f GB", gb)
+		},
+		"subtract": func(a, b int) int {
+			r := a - b
+			if r < 0 {
+				return 0
+			}
+			return r
+		},
+		"screenshotURL": func(slug string, index int) string {
+			return s.cfg.AppScreenshotURL(slug, index)
+		},
+		"seq": func(n int) []int {
+			result := make([]int, n)
+			for i := range result {
+				result[i] = i + 1
+			}
+			return result
+		},
+	}
+}