chore: promote manual workflows, product tour and Docker inventory

[veithly]

Promote the reviewed dev integration to main without a version bump, tag or release publication.

• Includes the trilingual product tour and mock screenshots from docs: full product tour with real human-agent workflow screenshots #16.
• Includes the manual-only CI and Release workflows, exact-commit release validation, evidence-backed required CI status reporting and default-draft publication policy from fix: manual-only CI/releases and safer Docker inventory #17.
• Includes Docker inventory/option-boundary improvements and the implementation plans for [Feature] 允许添加单独的docker container作为一个会话session #9/Feature Request: Add Comprehensive Proxy Support (HTTP, HTTPS, SOCKS4, SOCKS5) #12. Neither issue is being closed as fully implemented; Add CLI commands to create and delete saved SSH servers #10/Add Teleport servers that connect through tsh #11 remain open with changes requested.

#17 passed full manually dispatched CI (including all platforms, iOS simulator compile, isolated SSH compatibility, and actual status reporting): https://github.com/veithly/vibeshell/actions/runs/36551625273.

The new dev merge commit will receive its own manually dispatched full CI before this promotion is merged. All existing branch protection requirements remain in effect; no admin bypass or direct release dispatch.

[veithly]

Final integration verification (2026-09-29):

• Full manual CI on dev commit 6525d83 succeeded: https://github.com/veithly/vibeshell/actions/runs/36553146781. This includes all required platforms, iOS simulator compilation, isolated SSH compatibility and evidence-backed status reporting.
• All six required PR contexts passed. chore: promote manual workflows, product tour and Docker inventory #18 was merged normally, without --admin, at 2026-09-29T10:19:20Z. Main is e60a2f1; main and dev have identical file contents.
• CI and Release are now enabled and manual-only on both active branches. PR Target remains automatic and metadata-only. The temporary Release pause has been removed after verifying the main workflow has no push/tag trigger.
• All existing branch-protection requirements were retained. Release defaults to an unpublished draft and requires explicit publish=true plus successful exact-commit manual CI before publishing.
• No version bump, new tag, Release dispatch, public release, installed-app replacement or user-session termination occurred in this task. [Feature] 允许添加单独的docker container作为一个会话session #9/Feature Request: Add Comprehensive Proxy Support (HTTP, HTTPS, SOCKS4, SOCKS5) #12 remain open for the documented remaining work; Add CLI commands to create and delete saved SSH servers #10/Add Teleport servers that connect through tsh #11 remain unmerged pending fixes.