feat: add Telegram integration with forum topic support and creator tracking

Adds full Telegram ZIP ingestion pipeline: TDLib worker service scans source
channels for archive files, deduplicates by content hash, extracts metadata,
uploads to archive channel, and indexes in Postgres. Forum supergroups are
scanned per-topic with topic names used as creator. Filename-based creator
extraction (e.g. "Mammoth Factory - 2026-01.zip") serves as fallback.

Includes admin UI for managing accounts/channels, simplified account setup
(API credentials via env vars), auth code/password submission dialog,
package browser with creator column, and live ingestion activity tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

worker/src/archive/rar-reader.ts

@@ -0,0 +1,90 @@
+import { execFile } from "child_process";
+import { promisify } from "util";
+import path from "path";
+import { childLogger } from "../util/logger.js";
+import type { FileEntry } from "./zip-reader.js";
+
+const execFileAsync = promisify(execFile);
+const log = childLogger("rar-reader");
+
+/**
+ * Parse output of `unrar l -v <file>` to extract file metadata.
+ * unrar automatically discovers sibling parts when they're co-located.
+ */
+export async function readRarContents(
+  firstPartPath: string
+): Promise<FileEntry[]> {
+  try {
+    const { stdout } = await execFileAsync("unrar", ["l", "-v", firstPartPath], {
+      timeout: 30000,
+      maxBuffer: 10 * 1024 * 1024, // 10MB for very large archives
+    });
+
+    return parseUnrarOutput(stdout);
+  } catch (err) {
+    log.warn({ err, file: firstPartPath }, "Failed to read RAR contents");
+    return []; // Fallback: return empty on error
+  }
+}
+
+/**
+ * Parse the tabular output of `unrar l -v`.
+ *
+ * Example output format:
+ *  Archive: test.rar
+ *  Details: RAR 5
+ *
+ *   Attributes      Size     Packed Ratio   Date   Time   CRC-32  Name
+ *  ----------- ---------  --------- ----- -------- ----- --------  ----
+ *   ...A....      12345      10234  83%  2024-01-15 10:30 DEADBEEF  folder/file.stl
+ *  ----------- ---------  --------- ----- -------- ----- --------  ----
+ */
+function parseUnrarOutput(output: string): FileEntry[] {
+  const entries: FileEntry[] = [];
+  const lines = output.split("\n");
+
+  let inFileList = false;
+  let separatorCount = 0;
+
+  for (const line of lines) {
+    const trimmed = line.trim();
+
+    // Detect separator lines (------- pattern)
+    if (/^-{5,}/.test(trimmed)) {
+      separatorCount++;
+      if (separatorCount === 1) {
+        inFileList = true;
+      } else if (separatorCount >= 2) {
+        inFileList = false;
+      }
+      continue;
+    }
+
+    if (!inFileList) continue;
+
+    // Parse file entry line
+    // Format: Attributes Size Packed Ratio Date Time CRC Name
+    const match = trimmed.match(
+      /^\S+\s+(\d+)\s+(\d+)\s+\d+%\s+\S+\s+\S+\s+([0-9A-Fa-f]+)\s+(.+)$/
+    );
+
+    if (match) {
+      const [, uncompressedStr, compressedStr, crc32, filePath] = match;
+
+      // Skip directory entries (typically end with / or have size 0 with dir attributes)
+      if (filePath.endsWith("/") || filePath.endsWith("\\")) continue;
+
+      const ext = path.extname(filePath).toLowerCase();
+      entries.push({
+        path: filePath,
+        fileName: path.basename(filePath),
+        extension: ext ? ext.slice(1) : null,
+        compressedSize: BigInt(compressedStr),
+        uncompressedSize: BigInt(uncompressedStr),
+        crc32: crc32.toLowerCase(),
+      });
+    }
+  }
+
+  return entries;
+}