feat: fix channel scanning bugs, add package tags, and kickstarters tab

Bug fixes:
- Fix channels not being scanned by paginating TDLib getChats (was only
  loading first batch, additional channels were unknown to TDLib)
- Add per-channel getChat pre-load as safety net before scanning
- Fix preview pictures not loading by checking previewData instead of
  previewMsgId for hasPreview flag
- Prevent previewMsgId from being set when preview download fails

Package Tags:
- Add tags Text[] column to Package with migration backfilling from
  channel categories
- Worker auto-inherits source channel category as initial tag
- Tag filter dropdown and Tags column in STL Files table
- Server actions for individual and bulk tag editing

Kickstarters Tab:
- New KickstarterHost, Kickstarter, and KickstarterPackage models
- Full CRUD with delivery status, payment status, host management
- Package linking (many-to-many with existing packages)
- Sidebar entry with Gift icon
- Table with search, filters, modal forms

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/telegram/queries.ts

@@ -11,12 +11,14 @@ export async function listPackages(options: {
   limit: number;
   channelId?: string;
   creator?: string;
+  tag?: string;
   sortBy: "indexedAt" | "fileName" | "fileSize";
   order: "asc" | "desc";
 }) {
   const where: Record<string, unknown> = {};
   if (options.channelId) where.sourceChannelId = options.channelId;
   if (options.creator) where.creator = options.creator;
+  if (options.tag) where.tags = { has: options.tag };
 
   const [items, total] = await Promise.all([
     prisma.package.findMany({
@@ -34,7 +36,8 @@ export async function listPackages(options: {
         isMultipart: true,
         indexedAt: true,
         creator: true,
-        previewMsgId: true, // cheap null check — avoids loading blob
+        tags: true,
+        previewData: true, // check actual image data, not previewMsgId proxy
         sourceChannel: { select: { id: true, title: true } },
       },
     }),
@@ -49,8 +52,9 @@ export async function listPackages(options: {
     archiveType: pkg.archiveType,
     fileCount: pkg.fileCount,
     isMultipart: pkg.isMultipart,
-    hasPreview: pkg.previewMsgId !== null,
+    hasPreview: pkg.previewData !== null,
     creator: pkg.creator,
+    tags: pkg.tags,
     indexedAt: pkg.indexedAt.toISOString(),
     sourceChannel: pkg.sourceChannel,
   }));
@@ -96,8 +100,9 @@ export async function getPackageById(
     archiveType: pkg.archiveType,
     fileCount: pkg.fileCount,
     isMultipart: pkg.isMultipart,
-    hasPreview: pkg.previewMsgId !== null,
+    hasPreview: pkg.previewData !== null,
     creator: pkg.creator,
+    tags: pkg.tags,
     partCount: pkg.partCount,
     indexedAt: pkg.indexedAt.toISOString(),
     sourceChannel: pkg.sourceChannel,
@@ -208,7 +213,8 @@ export async function searchPackages(options: {
           isMultipart: true,
           indexedAt: true,
           creator: true,
-          previewMsgId: true,
+          tags: true,
+          previewData: true,
           sourceChannel: { select: { id: true, title: true } },
         },
       }),
@@ -223,8 +229,9 @@ export async function searchPackages(options: {
       archiveType: pkg.archiveType,
       fileCount: pkg.fileCount,
       isMultipart: pkg.isMultipart,
-      hasPreview: pkg.previewMsgId !== null,
+      hasPreview: pkg.previewData !== null,
       creator: pkg.creator,
+      tags: pkg.tags,
       indexedAt: pkg.indexedAt.toISOString(),
       sourceChannel: pkg.sourceChannel,
     }));
@@ -249,6 +256,16 @@ export async function searchPackages(options: {
   });
 }
 
+/**
+ * Get all distinct tags across all packages (for filter dropdowns).
+ */
+export async function getAllPackageTags(): Promise<string[]> {
+  const result = await prisma.$queryRaw<{ tag: string }[]>`
+    SELECT DISTINCT unnest(tags) AS tag FROM packages ORDER BY tag
+  `;
+  return result.map((r) => r.tag);
+}
+
 export async function getIngestionStatus(): Promise<IngestionAccountStatus[]> {
   const accounts = await prisma.telegramAccount.findMany({
     orderBy: { createdAt: "asc" },