AI Implementation feature(917): Category Icons (#65)

docs/architecture/backend-modules.md

@@ -3,7 +3,7 @@ type: architecture
 title: Backend Module Map
 description: NestJS modules, controllers, services, and how they are wired together.
 tags: [architecture, backend, nestjs, modules]
-timestamp: 2026-07-23T15:46:55Z
+timestamp: 2026-07-23T16:10:00Z
 ---
 
 # Module Map
@@ -86,6 +86,11 @@ also registers two global providers:
 → `DatabaseInitService.init()` → `FilesystemTransactionService.recoverTransactions()`
 (resolves interrupted restore manifests before TypeORM opens the live SQLite file;
 ambiguous generations abort startup) → stale unowned swap-artifact sweep → migrations + WAL
+→ `verifySeed()` (best-effort)
+→ `ensureSystemCategoryIcons()` (best-effort — writes
+`CRY/HW/MSC/PWN/REV/WEB.png` into `<UPLOAD_DIR>/icons/` if missing so
+freshly bootstrapped instances never serve 404 icons; see
+[System Category Icon Seed](/architecture/system-category-icons.md))
 → `app.use(...)` middlewares (helmet, parsers, CSRF, static)
 → `SwaggerModule.setup(...)` (OpenAPI 3.1)
 → `SpaFallbackMiddleware` → `app.listen()`.
@@ -94,6 +99,7 @@ ambiguous generations abort startup) → stale unowned swap-artifact sweep → m
 
 - [System Overview](/architecture/overview.md)
 - [Key Files Index](/architecture/key-files.md)
+- [System Category Icon Seed](/architecture/system-category-icons.md)
 - [REST API Overview](/api/rest-overview.md)
 - [Blog API](/api/blog.md)
 - [Admin System API](/api/admin-system.md)