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>

prisma/migrations/20260323000000_add_package_tags/migration.sql

@@ -0,0 +1,10 @@
+-- Add tags array column to packages
+ALTER TABLE "packages" ADD COLUMN "tags" TEXT[] NOT NULL DEFAULT '{}';
+
+-- Backfill: inherit source channel category as initial tag
+UPDATE "packages" p
+SET "tags" = ARRAY[c."category"]
+FROM "telegram_channels" c
+WHERE p."sourceChannelId" = c."id"
+  AND c."category" IS NOT NULL
+  AND c."category" != '';

prisma/migrations/20260323010000_add_kickstarters/migration.sql

@@ -0,0 +1,50 @@
+-- CreateEnum
+CREATE TYPE "DeliveryStatus" AS ENUM ('NOT_DELIVERED', 'PARTIAL', 'DELIVERED');
+CREATE TYPE "PaymentStatus" AS ENUM ('PAID', 'UNPAID');
+
+-- CreateTable
+CREATE TABLE "kickstarter_hosts" (
+    "id" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "kickstarter_hosts_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "kickstarters" (
+    "id" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "link" TEXT,
+    "filesUrl" TEXT,
+    "deliveryStatus" "DeliveryStatus" NOT NULL DEFAULT 'NOT_DELIVERED',
+    "paymentStatus" "PaymentStatus" NOT NULL DEFAULT 'UNPAID',
+    "notes" TEXT,
+    "hostId" TEXT,
+    "userId" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "kickstarters_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "kickstarter_packages" (
+    "kickstarterId" TEXT NOT NULL,
+    "packageId" TEXT NOT NULL,
+
+    CONSTRAINT "kickstarter_packages_pkey" PRIMARY KEY ("kickstarterId","packageId")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "kickstarter_hosts_name_key" ON "kickstarter_hosts"("name");
+CREATE INDEX "kickstarters_hostId_idx" ON "kickstarters"("hostId");
+CREATE INDEX "kickstarters_userId_idx" ON "kickstarters"("userId");
+CREATE INDEX "kickstarters_deliveryStatus_idx" ON "kickstarters"("deliveryStatus");
+CREATE INDEX "kickstarters_paymentStatus_idx" ON "kickstarters"("paymentStatus");
+
+-- AddForeignKey
+ALTER TABLE "kickstarters" ADD CONSTRAINT "kickstarters_hostId_fkey" FOREIGN KEY ("hostId") REFERENCES "kickstarter_hosts"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "kickstarters" ADD CONSTRAINT "kickstarters_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "kickstarter_packages" ADD CONSTRAINT "kickstarter_packages_kickstarterId_fkey" FOREIGN KEY ("kickstarterId") REFERENCES "kickstarters"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "kickstarter_packages" ADD CONSTRAINT "kickstarter_packages_packageId_fkey" FOREIGN KEY ("packageId") REFERENCES "packages"("id") ON DELETE CASCADE ON UPDATE CASCADE;