docs: add backup notes and refresh checklist

SUBSONIC_SERVER_BLUEPRINT.md

@@ -522,7 +522,7 @@ Responsibilities:
 - [x] Implement auth middleware
 - [x] Implement current user endpoint
 - [x] Implement admin bootstrap user creation
-- [ ] Add logout endpoint
+- [x] Add logout endpoint
 
 ## Library Scanning
 
@@ -550,7 +550,7 @@ Responsibilities:
 - [x] Track detail
 - [x] Recent albums
 - [x] Random albums or songs
-- [ ] Favorites listing
+- [x] Favorites listing
 - [x] Search endpoint
 - [ ] Pagination support
 - [ ] Sorting support
@@ -639,8 +639,8 @@ Responsibilities:
 - [x] Artist detail page
 - [x] Album detail page
 - [x] Playlist page
-- [ ] Search results page
-- [ ] Favorites page
+- [x] Search results page
+- [x] Favorites page
 - [ ] Recently played page
 
 ## Frontend Player
@@ -649,10 +649,10 @@ Responsibilities:
 - [x] Queue model
 - [x] Play/pause
 - [x] Next/previous
-- [ ] Seek bar
+- [x] Seek bar
 - [x] Volume control
-- [ ] Repeat modes
-- [ ] Shuffle
+- [x] Repeat modes
+- [x] Shuffle
 - [x] Track switching
 - [x] Keyboard shortcuts
 - [x] Mini player
@@ -683,7 +683,7 @@ Responsibilities:
 - [x] Single app port for web UI and Subsonic clients
 - [x] Reverse proxy example
 - [x] HTTP/reverse proxy deployment notes
-- [ ] Backup/restore notes
+- [x] Backup/restore notes
 
 ## Nice-to-Have After MVP