feat: add commandcode-hud-zh to community registry

[ObaidNadeem]

Adds commandcode-hud-zh to the community mods registry so users can discover and install Albert-Lsk's Chinese-language context HUD.

Carries over the registry entry from #980, which was accidentally merged into seed-mods-registry. This PR targets main, where the registry from #956 is already available. The original metadata and commit author are preserved, and all 12 existing registry entries remain unchanged.

cmd mods add Albert-Lsk/commandcode-hud-zh

Validation:

• Registry validates against mods/registry.schema.json with AJV and date/URI format checks.
• Confirmed the added entry exactly matches mods: add commandcode-hud-zh to community registry #980, with no duplicate mod names and no changes to existing entries.
• git diff --check passes. The diff adds 10 lines to mods/registry.json only.

This PR changes catalog metadata only. The HUD runtime checks documented in #980 were not rerun.

[Albert-Lsk]

Thanks for getting this in, Obaid — and for carrying the entry over from #980 so cleanly.

A quick heads-up on where the mod has gone since: it just landed v0.7.0, built around the one problem it was originally made for — the 502 "Stream ended unexpectedly before completion" failures (the pattern in #991 / #997: once a request grows past ~20 MB — often mostly inline base64 images — the gateway cuts the stream, identical retries keep failing, and a compaction fixes it immediately).

What v0.7.0 adds:

• Live request-size estimate — active context chain + fixed system/tool-schema overhead, image bytes tracked separately — shown as a 📦 12.9MB segment in the status row (hidden below ~2.3 MB so it only appears where it matters), with green → yellow → red tiers.
• Three proactive warning tiers (default 15 / 20 / 23 MB, once per session), and when a stream cut / retry actually happens, the notice names the likely cause (request size) instead of staying silent.
• /hud diagnostics now include the estimate breakdown and the red-line thresholds; --mod-option payload-limit-mb= rescales them.
• It's no longer Chinese-only — notifications and diagnostics follow the Command Code interface language (Chinese by default, English when the app is set to English); --mod-option lang=zh|en overrides.

Everything else is unchanged from what you reviewed: single file, zero dependencies, pure observer (cmd.on + one lifecycle hook + a command + flags — it never touches tool calls or the context), MIT, and install is still cmd mods add Albert-Lsk/commandcode-hud-zh.

One housekeeping question, since the mod isn't Chinese-specific anymore: I'm considering renaming the repo to a neutral name like commandcode-hud down the road. GitHub redirects old URLs, but the registry entry here points at Albert-Lsk/commandcode-hud-zh — so I'd rather ask first and send the one-line registry update PR together with it, or keep the current name if you prefer stability. No rush either way.