perf: migrate all user/session/auth IDs from VARCHAR(36) to native UUID

- Schema: all ~15 VARCHAR(36) columns → UUID with DEFAULT gen_random_uuid()
- Domain entities: User, Session, DeviceCode, AppPassword, Share → id: Uuid
- DTOs: CurrentUser.id → Uuid (API boundary DTOs keep String for JSON)
- Auth middleware: parse JWT claims.sub (String) → Uuid at boundary
- All repository traits, port traits, service impls updated end-to-end
- Handlers: pass Uuid by value (Copy, 16 bytes) instead of String refs
- Settings chain: updated_by column → Uuid (was text, caused setup crash)
- Removed ~650 lines of String↔Uuid conversion boilerplate
- Eliminates per-request heap allocations for ID cloning
- 16-byte binary comparison vs 36-byte string comparison in all queries
- Native UUID indexing in PostgreSQL (btree on 16 bytes vs 36-char text)

85 files changed, 1090 insertions(+), 1739 deletions(-)

src/interfaces/nextcloud/trashbin_handler.rs

@@ -75,7 +75,7 @@ async fn handle_propfind(
         .ok_or_else(|| AppError::internal_error("Trash service not available"))?;
 
     let items = trash_svc
-        .get_trash_items(&user.id)
+        .get_trash_items(user.id)
         .await
         .map_err(|e| AppError::internal_error(format!("Failed to list trash: {}", e)))?;
 
@@ -109,7 +109,7 @@ async fn handle_restore(
         .ok_or_else(|| AppError::internal_error("Trash service not available"))?;
 
     trash_svc
-        .restore_item(&id, &user.id)
+        .restore_item(&id, user.id)
         .await
         .map_err(|e| AppError::internal_error(format!("Failed to restore item: {}", e)))?;
 
@@ -131,7 +131,7 @@ async fn handle_empty_trash(
         .ok_or_else(|| AppError::internal_error("Trash service not available"))?;
 
     trash_svc
-        .empty_trash(&user.id)
+        .empty_trash(user.id)
         .await
         .map_err(|e| AppError::internal_error(format!("Failed to empty trash: {}", e)))?;
 
@@ -156,7 +156,7 @@ async fn handle_delete_permanent(
         .ok_or_else(|| AppError::internal_error("Trash service not available"))?;
 
     trash_svc
-        .delete_permanently(&id, &user.id)
+        .delete_permanently(&id, user.id)
         .await
         .map_err(|e| {
             AppError::internal_error(format!("Failed to permanently delete item: {}", e))