feat: register new club membership and join request routers

- Added club_memberships and club_join_requests routers to the backend, improving API functionality for managing club memberships and join requests.
- Bumped application version to 0.8.21 in both backend and frontend files.
- Updated changelog to reflect the new version and changes made in this release.

backend/main.py

@@ -161,6 +161,8 @@ app.include_router(profiles.router)
 app.include_router(exercises.router)
 app.include_router(exercise_progression_graphs.router)
 app.include_router(clubs.router)
+app.include_router(club_memberships.router)
+app.include_router(club_join_requests.router)
 app.include_router(admin_users.router)
 app.include_router(skills.router)
 app.include_router(training_planning.router)

backend/version.py

@@ -1,6 +1,6 @@
 # Shinkan Jinkendo Version Information
 
-APP_VERSION = "0.8.20"
+APP_VERSION = "0.8.21"
 BUILD_DATE = "2026-05-05"
 DB_SCHEMA_VERSION = "20260505041"
 
@@ -26,6 +26,13 @@ MODULE_VERSIONS = {
 }
 
 CHANGELOG = [
+    {
+        "version": "0.8.21",
+        "date": "2026-05-05",
+        "changes": [
+            "FastAPI: Router club_memberships und club_join_requests registriert (GET /api/clubs/{id}/members, join-requests u. a.) — behoben 404 auf Vereinsseite Tab Mitglieder",
+        ],
+    },
     {
         "version": "0.8.20",
         "date": "2026-05-05",

frontend/src/components/Navigation.jsx

@@ -10,7 +10,9 @@ function Navigation() {
   const selectClubId =
     user?.active_club_id != null && clubs.some((c) => c.id === user.active_club_id)
       ? user.active_club_id
-      : clubs[0]?.id  const handleLogout = async () => {
+      : clubs[0]?.id
+
+  const handleLogout = async () => {
     await logout()
     navigate('/login')
   }

frontend/src/version.js

@@ -1,6 +1,6 @@
 // Shinkan Jinkendo Frontend Version
 
-export const APP_VERSION = "0.8.20"
+export const APP_VERSION = "0.8.21"
 export const BUILD_DATE = "2026-05-05"
 
 export const PAGE_VERSIONS = {