feat: Docker audit + Telegram bot service + send UI

Docker:
- Harden docker-compose.yml: parameterized DB creds, required AUTH_SECRET,
  health checks, resource limits, network isolation, removed exposed DB port
- Add profiles (telegram/bot/full) so base 'docker compose up' needs only AUTH_SECRET
- Fix docker-entrypoint.sh: AUTH_SECRET startup guard
- Fix Dockerfile: copy prisma.config.ts + dotenv into production image
- Update .env.example with all new variables
- Update .dockerignore

Telegram Bot Service (bot/):
- TDLib-based bot using bot token auth (not HTTP Bot API)
- Commands: /search, /latest, /package, /link, /unlink, /subscribe, /unsubscribe
- pg_notify listener for send requests (bot_send) and new packages (new_package)
- Subscription-based notifications when matching packages arrive
- Dockerfile with multi-stage build (bookworm-slim for glibc/TDLib)

API & Database:
- Prisma: TelegramLink, BotSendRequest, BotSubscription models + migration
- POST /api/telegram/bot/send - queue package delivery to linked TG account
- GET /api/telegram/bot/send/[id] - poll send request status
- Server actions: generateTelegramLinkCode, unlinkTelegram, getBotSendHistory
- Worker: emit pg_notify('new_package') after creating packages

Frontend:
- Settings: TelegramLinkCard for account linking via one-time code
- STL table + drawer: SendToTelegramButton with send dialog and status polling
- Telegram admin: Bot Sends tab with delivery history table
- Shared SendHistoryRow type

README: Updated with bot docs, profiles, config vars, project structure

bot/Dockerfile

@@ -0,0 +1,46 @@
+# ── Stage 1: Install production deps ─────────────────────────
+FROM node:20-bookworm-slim AS deps
+
+RUN apt-get update && apt-get install -y \
+    libssl-dev zlib1g-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY bot/package.json bot/package-lock.json* ./
+COPY prisma/ ./prisma/
+
+# Install ALL deps (including devDependencies for tsc) and generate Prisma
+RUN npm ci && npx prisma generate
+
+# ── Stage 2: Build TypeScript ─────────────────────────────────
+FROM deps AS builder
+
+COPY bot/tsconfig.json ./
+COPY bot/src/ ./src/
+RUN npx tsc
+
+# ── Stage 3: Production runner ────────────────────────────────
+FROM node:20-bookworm-slim AS runner
+
+RUN apt-get update && apt-get install -y \
+    libssl3 zlib1g \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy only production node_modules
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/dist ./dist
+
+# Re-generate Prisma client
+RUN npx prisma generate
+
+RUN addgroup --system botuser && adduser --system --ingroup botuser botuser
+RUN mkdir -p /data/tdlib && chown -R botuser:botuser /data/tdlib
+USER botuser
+
+VOLUME ["/data/tdlib"]
+
+CMD ["node", "dist/index.js"]