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/error.rs

@@ -29,6 +29,12 @@ pub enum ApiError {
 
     #[error("Unauthorized: {0}")]
     Unauthorized(String),
+
+    #[error("password_required")]
+    PasswordRequired,
+
+    #[error("auth_required")]
+    AuthRequired,
 }
 
 /// Error response body
@@ -110,6 +116,22 @@ impl IntoResponse for ApiError {
                     details: Some(msg.clone()),
                 },
             ),
+
+            ApiError::PasswordRequired => (
+                StatusCode::UNAUTHORIZED,
+                ErrorResponse {
+                    error: "password_required".to_string(),
+                    details: None,
+                },
+            ),
+
+            ApiError::AuthRequired => (
+                StatusCode::UNAUTHORIZED,
+                ErrorResponse {
+                    error: "auth_required".to_string(),
+                    details: None,
+                },
+            ),
         };
 
         (status, Json(error_response)).into_response()