feat(storage): add controller tests, Caddy config, and PWA improvements

Controller tests (50 tests, all passing):
- FileController: 12 tests (CRUD, upload, download with headers/URL mode)
- FolderController: 8 tests (CRUD, move, favorite)
- TrashController: 6 tests (restore file/folder, permanent delete, empty)
- SearchController: 6 tests (search, empty query, favorites)
- ShareController: 7 tests (CRUD, expiresInDays conversion, public token)
- TagController: 7 tests (CRUD with optional color)

Total test count now: 159 (133 backend + 26 web)

Deployment:
- Add Caddy reverse proxy entries for storage.mana.how and storage-api.mana.how

PWA:
- Upgrade to 'full' preset for better offline caching (fonts, external resources)
- Add app shortcuts: Dateien, Suche, Favoriten
- Improve offline page with links to cached pages

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/caddy/Caddyfile.production

@@ -82,6 +82,17 @@ contacts-api.mana.how {
     reverse_proxy localhost:3034
 }
 
+# ============================================
+# Storage App
+# ============================================
+storage.mana.how {
+    reverse_proxy localhost:5015
+}
+
+storage-api.mana.how {
+    reverse_proxy localhost:3035
+}
+
 # ============================================
 # Skilltree App
 # ============================================
@@ -104,6 +115,17 @@ lightwrite-api.mana.how {
     reverse_proxy localhost:3010
 }
 
+# ============================================
+# Picture App
+# ============================================
+picture.mana.how {
+    reverse_proxy localhost:5021
+}
+
+picture-api.mana.how {
+    reverse_proxy localhost:3040
+}
+
 # ============================================
 # LLM Playground
 # ============================================