feat: add skill editing and human confirmation (#40)

[Whitehira]

Summary

Closes #40

Changes

Backend (Python)

• Added POST /update endpoint in server.py with UpdateRequest model
• Reads existing item, updates content fields (name, description, body, parameters, tags), writes back
• When confirm: true, sets provenance.confidence = 1.0 and verified = true

Frontend (TypeScript/React)

• Added UpdateRequest / UpdateResponse types in types.ts
• Added ctx.update() method in ctxClient.ts
• Complete edit mode in SkillDetailDialog:
  • ?? Editable fields: name, description, body, parameters (JSON textarea with validation), tags
  • ? Human confirmation button (sets 100% confidence)
  • ??? State badges: auto-generated (blue) / edited (yellow) / confirmed (green)
  • ?? Visual distinction: yellow ring border on edited-but-unconfirmed skills
  • ? Error/success messages for save and confirmation failures
  • ?? Auto-refresh after save/confirm
• Three-language i18n (zh/en/ja)

Acceptance Criteria

• A user can open a skill from the Skills page and enter edit mode
• A user can edit the skill name, description, body, parameters, and tags
• Edited content persists after page refresh
• A user can manually confirm a skill
• Confirmed skills display 100% confidence
• The UI distinguishes auto-generated, edited, and confirmed states
• Save or confirmation failures show clear error messages

Files changed

File	Changes
src/contextseek/http/server.py	+84 lines
dashboard/src/lib/types.ts	+18 lines
dashboard/src/lib/ctxClient.ts	+3 lines
dashboard/src/lib/i18n.tsx	+48 lines
dashboard/src/panels/SkillsPanel.tsx	+410/-51 lines