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/README.md

@@ -24,7 +24,7 @@ controller generates secrets, saves app.yaml, runs `docker compose up -d`, and t
 with Traefik routing and health checks. The dashboard correctly shows real-time container states
 including health substatus (starting → healthy → running).
 
-Current version: **v0.2.111**
+Current version: **v0.3.0**
 
 ### What works
 - Dashboard with live container state (green/orange/yellow/red)
@@ -106,8 +106,16 @@ controller/
 │   │   ├── info_linux.go            # Linux: /proc/meminfo + statfs
 │   │   └── info_other.go            # Non-Linux stub
 │   └── web/
-│       ├── server.go                # HTTP server, auth, page handlers, asset serving
-│       └── templates.go             # Embedded HTML templates + CSS (Hungarian UI)
+│       ├── server.go                # HTTP server, routing, static file serving
+│       ├── auth.go                  # Session auth, login/logout handlers
+│       ├── handlers.go              # Page handlers (dashboard, stacks, deploy, etc.)
+│       ├── funcmap.go               # Template function map (state colors, formatting)
+│       ├── embed.go                 # go:embed directive for templates
+│       ├── templates.go             # Felhom logo SVG constant
+│       └── templates/               # go:embed HTML/CSS files (Hungarian UI)
+│           ├── layout.html, dashboard.html, stacks.html, login.html
+│           ├── logs.html, deploy.html, app_info.html
+│           └── style.css
 ├── configs/
 │   ├── controller.yaml.example      # Full config reference (infrastructure only)
 │   └── example-felhom-metadata.yml  # .felhom.yml format reference