feat(security): library visibility enforced at the source; per-library series; annotation ownership; admin user creation

The family-lens hardening: library_visibility was only enforced where
file bytes flowed (download/reader/OPDS) — metadata surfaces leaked
hidden libraries to any authenticated account, and registration was
open by default with no admin-side user creation.

- Series are grouped PER LIBRARY now (same name in two libraries =
  two entries: manga adaptations / LN splits no longer merge);
  /api/series aggregates only the requester's VISIBLE libraries and
  /api/series/books REQUIRES a visible library_id (breaking contract;
  web + app clients updated in the same change).
- /api/media-items, item detail, and the reader content endpoints
  (chapters/panels/outline/THUMBNAILS — page images leaked unguarded
  next to a gated GetPage) all enforce the visible set; resolveLibrary
  no longer honors a hand-typed library_id outside the visible set.
- Annotation/note/bookmark mutations (update/delete/tombstone, sync
  LWW paths incl. conflict resolution) carry ownership predicates:
  another account's bare row id is a 404, not a silent delete.
- Admin user creation: POST /api/auth/users (AdminMiddleware) + a
  Create User card in the admin Users UI — accounts stay creatable
  with self-service registration OFF, which is now the schema default
  (fresh installs; the first-admin bootstrap exception is unchanged).
- Tests: series contract re-pinned (per-library, visibility 403s),
  new ownership + admin-create integration suites, OPDS all=1 test
  now passes an explicit page size (shared-DB growth made the fresh
  books fall off page 1), device-cap helper switched to the admin
  endpoint.

templates/collection_modal_templ.go

@@ -72,7 +72,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var2 string
 			templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.ResolveAttributeValue("/api/collections/" + collection.ID)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 23, Col: 49}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 23, Col: 49}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var2)
 			if templ_7745c5c3_Err != nil {
@@ -85,7 +85,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var3 string
 			templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.ResolveAttributeValue(collection.ID)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 26, Col: 57}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 26, Col: 57}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var3)
 			if templ_7745c5c3_Err != nil {
@@ -98,7 +98,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var4 string
 			templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.ResolveAttributeValue(collection.Name)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 32, Col: 30}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 32, Col: 30}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var4)
 			if templ_7745c5c3_Err != nil {
@@ -111,7 +111,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var5 string
 			templ_7745c5c3_Var5, templ_7745c5c3_Err = templ.JoinStringErrs(collection.Description)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 45, Col: 31}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 45, Col: 31}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var5))
 			if templ_7745c5c3_Err != nil {
@@ -124,7 +124,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var6 string
 			templ_7745c5c3_Var6, templ_7745c5c3_Err = templ.ResolveAttributeValue(collection.Icon)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 58, Col: 83}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 58, Col: 83}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var6)
 			if templ_7745c5c3_Err != nil {
@@ -137,7 +137,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var7 string
 			templ_7745c5c3_Var7, templ_7745c5c3_Err = templ.ResolveAttributeValue(collection.Color)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 74, Col: 86}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 74, Col: 86}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var7)
 			if templ_7745c5c3_Err != nil {
@@ -155,7 +155,7 @@ func CollectionModal(collection CollectionData) templ.Component {
 			var templ_7745c5c3_Var8 string
 			templ_7745c5c3_Var8, templ_7745c5c3_Err = templ.ResolveAttributeValue(collection.Icon)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/collection_modal.templ`, Line: 116, Col: 83}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `collection_modal.templ`, Line: 116, Col: 83}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var8)
 			if templ_7745c5c3_Err != nil {