feat: add preview management, channel controls, invite polish, and recovery

- Auto-extract preview images from ZIP/RAR/7z archives during ingestion
- Upload custom preview images via package drawer
- Select preview from archive contents with on-demand extraction UI
- Manually add Telegram channels by t.me link, username, or invite link
- Invite code UX: bulk create, copy link, usage tracking, delete confirm
- Incomplete upload recovery: verify dest messages on worker startup
- Rebuild package DB by scanning destination channel with live progress

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

worker/Dockerfile

@@ -3,7 +3,7 @@ FROM node:20-bookworm-slim AS deps
 
 RUN sed -i 's/^Components: main$/Components: main non-free/' /etc/apt/sources.list.d/debian.sources && \
     apt-get update && apt-get install -y \
-    libssl-dev zlib1g-dev unrar p7zip-full \
+    libssl-dev zlib1g-dev unzip unrar p7zip-full \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
@@ -26,7 +26,7 @@ FROM node:20-bookworm-slim AS runner
 
 RUN sed -i 's/^Components: main$/Components: main non-free/' /etc/apt/sources.list.d/debian.sources && \
     apt-get update && apt-get install -y \
-    libssl3 zlib1g unrar p7zip-full \
+    libssl3 zlib1g unzip unrar p7zip-full \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app