feat(library): add Bibliothek module — books/movies/series/comics log

M1 skeleton for a new media-consumption module. Single-table design with
a `kind: 'book' | 'movie' | 'series' | 'comic'` discriminator and a
discriminated `details` union for kind-specific fields (pages / runtime /
episode tracker / issue count). Shared kern: status, rating, review,
favourites, times counter, completedAt — which enables cross-media
queries like a year-in-review.

Dexie migration v26 was already registered in module-registry.ts /
database.ts via the preceding wetter commit (62aac6dfd); this commit
adds the actual module code, encryption registry entry, app-icon,
MANA_APPS entry, Kreativität & Medien category row, and the module
plan at docs/plans/library-module.md.

Encrypted fields (via ENCRYPTION_REGISTRY):
  title, originalTitle, creators, review, tags
Plaintext (intentional):
  kind, status, year, rating, genres, completedAt, isFavorite, times,
  externalIds, details — all needed for the tab filter, status chips,
  Jahresrückblick range-scan, and progress UIs.

Product decisions (frozen in the plan):
  - audiobooks = kind='book' with details.format='audio'
  - manga     = kind='comic' (no sub-discriminator)
  - metadata lookup (M7) lands as an endpoint in apps/api, not a
    standalone service

Guest seed ships one example per kind (Dune, Arrival, Severance, Saga)
so first-run users immediately see what the module does.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/MODULE_REGISTRY.md

@@ -1,6 +1,6 @@
 # Mana Module Registry
 
-Alle 72 Module der Mana-App (`apps/mana/apps/web/src/lib/modules/`).
+Alle 73 Module der Mana-App (`apps/mana/apps/web/src/lib/modules/`).
 
 ---
 
@@ -33,7 +33,7 @@ Alle 72 Module der Mana-App (`apps/mana/apps/web/src/lib/modules/`).
 | `mood` | Mood | Stimmungs-Tracking mehrmals täglich mit Kontext und Mustern |
 | `moodlit` | Moodlit | Beruhigende Ambient-Beleuchtung mit animierten Farbverläufen |
 
-## Kreativität & Medien (7)
+## Kreativität & Medien (8)
 
 | Modul | Name | Beschreibung |
 |---|---|---|
@@ -43,6 +43,7 @@ Alle 72 Module der Mana-App (`apps/mana/apps/web/src/lib/modules/`).
 | `presi` | Presi | Präsentationen mit AI-Design-Vorschlägen |
 | `cards` | Cards | AI-generierte Flashcards mit Spaced Repetition |
 | `recipes` | Rezepte | Rezepte sammeln mit Zutaten und Schritten |
+| `library` | Bibliothek | Bücher, Filme, Serien, Comics — Status, Rating, Fortschritt |
 | `storage` | Storage | Cloud-Storage mit Ordnern, Versionierung und Sharing |
 
 ## Wissen & Lernen (7)