chore: bump version to 1.2.0

New in 1.2.0:
- feat: debounced inline queries, bounded graceful shutdown, config
  fail-fast on invalid env values
- fix: local-media tasks (ugoira/bsky MP4) survive queue retries,
  photo-first ordering in mixed media groups, caption truncation to
  Telegram's 1024-char limit
- perf: SQLite connection pool, concurrent upload-fallback downloads,
  ugoira zip streamed to disk, photo processing without re-reading the
  temp file, release profile LTO
- ci: test/clippy gate + layered live/token job
- docs: English README (README.en.md)

Cargo.lock

@@ -2925,7 +2925,7 @@ checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
 
 [[package]]
 name = "x-media"
-version = "1.1.1"
+version = "1.2.0"
 dependencies = [
  "bytes",
  "dotenv",
@@ -2944,7 +2944,7 @@ dependencies = [
 
 [[package]]
 name = "xmedia-bot"
-version = "1.1.1"
+version = "1.2.0"
 dependencies = [
  "bytes",
  "dotenv",