feat(cron): add per-job permission mode override

[mkloveyy]

Summary

• Allow individual cron jobs to specify a permission mode (e.g. bypassPermissions) independent of the project default
• Mode is applied via LiveModeSwitcher.SetLiveMode() before execution and restored via defer after completion
• Added PATCH support to management API for editing existing cron jobs
• Web dashboard supports viewing and editing mode per job

Background

Cron jobs run unattended but inherit the project's permission mode. With mode = "default", a cron job that triggers tool calls (Bash, Write, etc.) will block waiting for user approval — defeating the purpose of automation. This feature lets users set mode = "bypassPermissions" on specific cron jobs while keeping the project in default mode for interactive sessions.

Changes

• core/cron.go — Mode field on CronJob + validation + updateJobField support
• core/message.go — ModeOverride field on Message as runtime carrier
• core/engine.go — Apply/restore mode in processInteractiveMessageWith
• core/api.go — CronAddRequest.Mode + job construction
• core/management.go — CronAddRequest.Mode + PATCH handler for /cron/{id}
• web/ — Inline mode selector, create form dropdown, i18n (5 languages)

Test plan

• go build ./... passes
• go test ./core/ -run TestCron -v passes
• Manual test: cron with bypassPermissions auto-approved Write tool, no permission prompt
• Manual test: subsequent user message on same session correctly prompted for permission (mode restored)

[chenhg5]

LGTM. Useful feature for cron job automation.

Review notes:

• ✅ CI passes
• Adds per-job permission mode override (mode field on CronJob)
• Proper validation of mode values
• Mode applied via LiveModeSwitcher.SetLiveMode() and restored via defer
• Good test coverage

This enables unattended cron jobs to bypass permissions while keeping project in default mode for interactive sessions. Approved for merge.

[mkloveyy]

@chenhg5 Hi, I've just rebased this branch onto latest main and resolved all the merge conflicts (management.go, CronList.tsx, i18n files, cron.ts). Build and tests pass. Could you take a look and merge when you get a chance? Thanks!