feat: add per-playlist cron sync schedules

Each playlist now has its own cron schedule for syncing with Spotify. Default is 0 8 * * 1 (Monday 8 AM). Removed global MatchingIntervalHours in favor of per-playlist scheduling.

allstarr/Controllers/AdminController.cs

@@ -2274,12 +2274,19 @@ public class AdminController : ControllerBase
             Name = request.Name,
             Id = request.SpotifyPlaylistId,
             JellyfinId = jellyfinPlaylistId,
-            LocalTracksPosition = LocalTracksPosition.First // Use Spotify order
+            LocalTracksPosition = LocalTracksPosition.First, // Use Spotify order
+            SyncSchedule = request.SyncSchedule ?? "0 8 * * 1" // Default to Monday 8 AM
         });
         
-        // Convert to JSON format for env var: [["Name","SpotifyId","JellyfinId","first|last"],...]
+        // Convert to JSON format for env var: [["Name","SpotifyId","JellyfinId","first|last","cronSchedule"],...]
         var playlistsJson = JsonSerializer.Serialize(
-            currentPlaylists.Select(p => new[] { p.Name, p.Id, p.JellyfinId, p.LocalTracksPosition.ToString().ToLower() }).ToArray()
+            currentPlaylists.Select(p => new[] { 
+                p.Name, 
+                p.Id, 
+                p.JellyfinId, 
+                p.LocalTracksPosition.ToString().ToLower(),
+                p.SyncSchedule ?? "0 8 * * 1"
+            }).ToArray()
         );
         
         // Update .env file
@@ -2335,7 +2342,7 @@ public class AdminController : ControllerBase
                         return playlists;
                     }
                     
-                    // Parse JSON array format: [["Name","SpotifyId","JellyfinId","first|last"],...]
+                    // Parse JSON array format: [["Name","SpotifyId","JellyfinId","first|last","cronSchedule"],...]
                     var playlistArrays = JsonSerializer.Deserialize<string[][]>(value);
                     if (playlistArrays != null)
                     {
@@ -2351,7 +2358,8 @@ public class AdminController : ControllerBase
                                     LocalTracksPosition = arr.Length >= 4 && 
                                         arr[3].Trim().Equals("last", StringComparison.OrdinalIgnoreCase)
                                         ? LocalTracksPosition.Last
-                                        : LocalTracksPosition.First
+                                        : LocalTracksPosition.First,
+                                    SyncSchedule = arr.Length >= 5 ? arr[4].Trim() : "0 8 * * 1"
                                 });
                             }
                         }
@@ -3406,6 +3414,7 @@ public class LinkPlaylistRequest
 {
     public string Name { get; set; } = string.Empty;
     public string SpotifyPlaylistId { get; set; } = string.Empty;
+    public string SyncSchedule { get; set; } = "0 8 * * 1"; // Default: 8 AM every Monday
 }
 
     /// <summary>

allstarr/Models/Settings/SpotifyImportSettings.cs

@@ -45,6 +45,14 @@ public class SpotifyPlaylistConfig
     /// Where to position local tracks: "first" or "last"
     /// </summary>
     public LocalTracksPosition LocalTracksPosition { get; set; } = LocalTracksPosition.First;
+    
+    /// <summary>
+    /// Cron schedule for syncing this playlist with Spotify
+    /// Format: minute hour day month dayofweek
+    /// Example: "0 8 * * 1" = 8 AM every Monday
+    /// Default: "0 8 * * 1" (weekly on Monday at 8 AM)
+    /// </summary>
+    public string SyncSchedule { get; set; } = "0 8 * * 1";
 }
 
 /// <summary>

allstarr/wwwroot/index.html

@@ -1254,6 +1254,17 @@
                 </small>
             </div>
             
+            <!-- Sync Schedule -->
+            <div class="form-group">
+                <label>Sync Schedule (Cron)</label>
+                <input type="text" id="link-sync-schedule" placeholder="0 8 * * 1" value="0 8 * * 1" style="font-family: monospace;">
+                <small style="color: var(--text-secondary); display: block; margin-top: 4px;">
+                    Cron format: <code>minute hour day month dayofweek</code><br>
+                    Default: <code>0 8 * * 1</code> = 8 AM every Monday<br>
+                    Examples: <code>0 6 * * *</code> = daily at 6 AM, <code>0 20 * * 5</code> = Fridays at 8 PM
+                </small>
+            </div>
+            
             <div class="modal-actions">
                 <button onclick="closeModal('link-playlist-modal')">Cancel</button>
                 <button class="primary" onclick="linkPlaylist()">Link Playlist</button>
@@ -2080,6 +2091,19 @@
         async function linkPlaylist() {
             const jellyfinId = document.getElementById('link-jellyfin-id').value;
             const name = document.getElementById('link-jellyfin-name').value;
+            const syncSchedule = document.getElementById('link-sync-schedule').value.trim();
+            
+            // Validate sync schedule (basic cron format check)
+            if (!syncSchedule) {
+                showToast('Sync schedule is required', 'error');
+                return;
+            }
+            
+            const cronParts = syncSchedule.split(/\s+/);
+            if (cronParts.length !== 5) {
+                showToast('Invalid cron format. Expected: minute hour day month dayofweek', 'error');
+                return;
+            }
             
             // Get Spotify ID based on current mode
             let spotifyId = '';
@@ -2119,7 +2143,11 @@
                 const res = await fetch(`/api/admin/jellyfin/playlists/${encodeURIComponent(jellyfinId)}/link`, {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
-                    body: JSON.stringify({ name, spotifyPlaylistId: cleanSpotifyId })
+                    body: JSON.stringify({ 
+                        name, 
+                        spotifyPlaylistId: cleanSpotifyId,
+                        syncSchedule: syncSchedule
+                    })
                 });
                 
                 const data = await res.json();