docs(reference): sync slash-command tables with the command registry

[A-KH17]

What does this PR do?

Brings the zh-Hans slash-commands reference back in sync with the command registry in hermes_cli/commands.py:

• Removes /credits and /billing — neither command is registered anywhere at HEAD (CLI registry, gateway, or TUI). Billing was unified under /topup in v0.19.0, but the zh-Hans reference still tells users to type the retired commands.
• Adds /topup (CLI + messaging) and /subscription (alias /upgrade, CLI-only) — both previously undocumented in zh-Hans.
• Adds /journey (aliases /learning, /memory-graph) — available in the classic CLI, as a TUI overlay, and in the desktop app (Star Map panel); not available on messaging platforms.
• Updates the CLI-only / both-surfaces availability lists accordingly.

The English half of the original sync landed upstream in 43874d1a; this PR now carries only the still-missing zh-Hans corrections.

Related Issue

N/A — small, self-verifying docs correction; no issue filed. Happy to open one if preferred.

Type of Change

• 📝 Documentation update

Changes Made

• website/i18n/zh-Hans/docusaurus-plugin-content-docs/current/reference/slash-commands.md: Info table (−/credits, −/billing, +/topup, +/subscription), Session table (+/journey), Messaging table (−/credits, +/topup), CLI-only list (−/billing, +/journey, +/subscription), both-surfaces list (−/credits, +/topup).
• contributors/emails/: email→login mapping for the commit author.

How to Test

1. grep -n 'CommandDef("topup"\|CommandDef("subscription"\|CommandDef("journey"' hermes_cli/commands.py — all three registered.
2. grep -nE 'credits|billing' website/i18n/zh-Hans/docusaurus-plugin-content-docs/current/reference/slash-commands.md — only the /topup row's historical note remains.
3. /journey TUI registration: ui-tui/src/app/slash/commands/ops.ts:329-334.

Checklist

• I've read the Contributing Guide
• My commit messages follow Conventional Commits
• I searched for existing PRs — no duplicate found
• My PR contains only changes related to this fix
• pytest — N/A: docs-only change, no code paths touched
• I've considered cross-platform impact — N/A (documentation only)

[teknium1]

Thanks for identifying the stale command reference. The zh-Hans corrections remain needed: current main still lists /credits and /billing at website/i18n/zh-Hans/docusaurus-plugin-content-docs/current/reference/slash-commands.md:109-110 and /credits at :218.

Problems

• The English changes have already landed in 43874d1a96134729ff65d8a0da84a38ef0fc723b; current main has the replacement entries at website/docs/reference/slash-commands.md:126-127 and :240. The PR is now conflicting, and reapplying its English /journey row would duplicate the existing rows at :66 and :68.
• The new zh-Hans /journey wording says CLI-only, but the TUI registers the command and its aliases at ui-tui/src/app/slash/commands/ops.ts:329-334.

Suggested changes

• Salvage the zh-Hans command-table and availability-list corrections only, and align the /journey wording with its TUI support.

Automated hermes-sweeper review.

[teknium1]

cli_only excludes the messaging gateway, but /journey is also registered in the TUI at ui-tui/src/app/slash/commands/ops.ts:329-334. Please describe its local-surface availability consistently rather than calling it CLI-only.

[A-KH17]

Thanks for the review — both points addressed in the reworked branch (now a single commit on current main):

1. English changes dropped — confirmed they already landed in 43874d1a; the PR now carries only the zh-Hans corrections, which are still needed on main (/credits at :109-110 and :218, /billing in the CLI-only list). No conflict, no /journey row duplication.
2. /journey wording fixed — the zh-Hans row now mirrors the current English wording: works in the classic CLI, as a TUI overlay, and in the desktop app (Star Map panel); not available on messaging platforms. Registered in the TUI at ui-tui/src/app/slash/commands/ops.ts:329-334, as you noted.