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/templates/stacks.html

@@ -0,0 +1,76 @@
+{{define "stacks"}}
+{{template "layout_start" .}}
+
+<div class="page-header">
+    <h2>Alkalmazások</h2>
+    <span class="domain-badge">{{.Domain}}</span>
+    <button class="btn btn-sm btn-outline" id="sync-btn" onclick="syncTemplates()" title="Sablonok frissítése a központi katalógusból">↻ Sablonok frissítése</button>
+</div>
+<div id="sync-toast" class="sync-toast" style="display:none"></div>
+
+<div class="stack-grid">
+    {{range .Stacks}}
+    <div class="stack-detail-card stack-state-{{stateColor .State}}"{{if not .Protected}} data-href="/apps/{{.Meta.Slug}}"{{end}}>
+        <div class="stack-detail-header">
+            <div class="stack-title-row">
+                <img class="stack-logo-lg" src="{{logoURL .Meta.Slug}}"
+                     alt="" onerror="this.onerror=function(){this.style.display='none'};this.src='{{logoPNGURL .Meta.Slug}}'">
+                <div>
+                    <h3>{{.Meta.DisplayName}}</h3>
+                    {{if .Meta.Subdomain}}
+                    <a class="subdomain-link" href="https://{{.Meta.Subdomain}}.{{$.Domain}}" target="_blank">
+                        {{.Meta.Subdomain}}.{{$.Domain}} ↗
+                    </a>
+                    {{end}}
+                </div>
+            </div>
+            <span class="stack-state-badge state-{{stateColor .State}}">{{stateLabel .State}}</span>
+            {{if .Orphaned}}<span class="badge badge-orphaned">Elavult</span>{{end}}
+        </div>
+
+        {{if .Meta.Description}}
+        <p class="stack-detail-desc">{{.Meta.Description}}</p>
+        {{end}}
+
+        <div class="stack-meta-badges">
+            {{if .Meta.Resources.MemRequest}}<span class="meta-badge">~{{.Meta.Resources.MemRequest}}</span>{{end}}
+            {{if .Meta.Resources.PiCompatible}}<span class="meta-badge meta-badge-ok">Pi kompatibilis</span>{{end}}
+            {{if .Meta.Resources.NeedsHDD}}<span class="meta-badge">HDD szükséges</span>{{end}}
+        </div>
+
+        {{if .Containers}}
+        <div class="container-list">
+            {{range .Containers}}
+            <div class="container-row">
+                <span class="container-name">{{.Name}}</span>
+                <span class="container-status state-text-{{stateColor .State}}">{{.Status}}</span>
+            </div>
+            {{end}}
+        </div>
+        {{end}}
+
+        <div class="stack-detail-actions">
+            {{if .Protected}}
+                <span class="badge badge-protected">Védett rendszerkomponens</span>
+            {{else if not .Deployed}}
+                <a href="/stacks/{{.Name}}/deploy" class="btn btn-primary" onclick="return checkBeforeDeploy(event, '{{.Name}}')">Telepítés</a>
+                <a href="{{appPageURL .Meta.Slug}}" class="btn btn-outline">Részletek</a>
+            {{else}}
+                {{if isOperational .State}}
+                    {{if not .Orphaned}}<button class="btn btn-success" onclick="stackAction('{{.Name}}', 'update')">Frissítés</button>{{end}}
+                    <button class="btn btn-warning" onclick="stackAction('{{.Name}}', 'restart')">Újraindítás</button>
+                    <button class="btn btn-danger" onclick="stackAction('{{.Name}}', 'stop')">Leállítás</button>
+                {{else}}
+                    <button class="btn btn-success" onclick="stackAction('{{.Name}}', 'start')">Indítás</button>
+                {{end}}
+                <a href="/stacks/{{.Name}}/logs" class="btn btn-outline">Naplók</a>
+                {{if not .Orphaned}}<a href="{{appPageURL .Meta.Slug}}" class="btn btn-outline">Részletek</a>{{end}}
+                {{if .Orphaned}}<button class="btn btn-danger" onclick="deleteOrphanStack('{{.Name}}')">Törlés</button>{{end}}
+            {{end}}
+        </div>
+    </div>
+    {{end}}
+</div>
+
+{{template "layout_end" .}}
+{{end}}