chore: bump version to 1.6.0

Bump both crates (x-media, xmedia-bot) and refresh the lockfile to the
latest semver-compatible releases. No direct dependency or manifest
requirement changed.

AGENTS.md

@@ -4,7 +4,7 @@
 
 Telegram bot (teloxide) that turns post links from X/Twitter, Pixiv, Bluesky, and Misskey (misskey.io) into media messages (images, video, GIF) with the post's title, author, and tags. It supports batch media splitting, retry with persistence, inline queries, forward-channel rebinding with caption templates, and Pixiv ugoira→MP4 transcoding. README is in Chinese; user-facing bot strings are in English. The project is a Rust port of a Python predecessor (see `queue.rs` comments referencing `utils/task_queue.py`).
 
-Two-crate Cargo workspace (both v1.5.0, edition 2024, resolver 3):
+Two-crate Cargo workspace (both v1.6.0, edition 2024, resolver 3):
 
 - **`crates/x-media`** — library that fetches and normalizes media from the four sites. Pure, no Telegram knowledge.
 - **`crates/xmedia-bot`** — the bot binary: teloxide dispatcher, SQLite-backed chat state, persistent task queue.

crates/x-media/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "x-media"
-version = "1.5.0"
+version = "1.6.0"
 edition = "2024"
 
 [dependencies]

crates/xmedia-bot/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "xmedia-bot"
-version = "1.5.0"
+version = "1.6.0"
 edition = "2024"
 
 [dependencies]