feat: add access control to channels with various modes

- Introduced AccessMode enum to define channel access levels: Public, PasswordProtected, AccountRequired, and OwnerOnly.
- Updated Channel and ProgrammingBlock entities to include access_mode and access_password_hash fields.
- Enhanced create and update channel functionality to handle access mode and password.
- Implemented access checks in channel routes based on the defined access modes.
- Modified frontend components to support channel creation and editing with access control options.
- Added ChannelPasswordModal for handling password input when accessing restricted channels.
- Updated API calls to include channel and block passwords as needed.
- Created database migrations to add access_mode and access_password_hash columns to channels table.

k-tv-backend/api/src/extractors.rs

@@ -38,6 +38,29 @@ impl FromRequestParts<AppState> for CurrentUser {
     }
 }
 
+/// Optional current user — returns None instead of error when auth is missing/invalid.
+pub struct OptionalCurrentUser(pub Option<User>);
+
+impl FromRequestParts<AppState> for OptionalCurrentUser {
+    type Rejection = ApiError;
+
+    async fn from_request_parts(
+        parts: &mut Parts,
+        state: &AppState,
+    ) -> Result<Self, Self::Rejection> {
+        #[cfg(feature = "auth-jwt")]
+        {
+            return Ok(OptionalCurrentUser(try_jwt_auth(parts, state).await.ok()));
+        }
+
+        #[cfg(not(feature = "auth-jwt"))]
+        {
+            let _ = (parts, state);
+            Ok(OptionalCurrentUser(None))
+        }
+    }
+}
+
 /// Authenticate using JWT Bearer token
 #[cfg(feature = "auth-jwt")]
 async fn try_jwt_auth(parts: &mut Parts, state: &AppState) -> Result<User, ApiError> {