feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/ui-ux-pro-max/SKILL.md

@@ -0,0 +1,43 @@
+---
+name: ui-ux-pro-max
+description: UI/UX design intelligence and implementation guidance for building polished interfaces. Use when the user asks for UI design, UX flows, information architecture, visual style direction, design systems/tokens, component specs, copy/microcopy, accessibility, or to generate/critique/refine frontend UI (HTML/CSS/JS, React, Next.js, Vue, Svelte, Tailwind). Includes workflows for (1) generating new UI layouts and styling, (2) improving existing UI/UX, (3) producing design-system tokens and component guidelines, and (4) turning UX recommendations into concrete code changes.
+---
+
+Follow these steps to deliver high-quality UI/UX output with minimal back-and-forth.
+
+## 1) Triage
+Ask only what you must to avoid wrong work:
+- Target platform: web / iOS / Android / desktop
+- Stack (if code changes): React/Next/Vue/Svelte, CSS/Tailwind, component library
+- Goal and constraints: conversion, speed, brand vibe, accessibility level (WCAG AA?)
+- What you have: screenshot, Figma, repo, URL, user journey
+
+If the user says "全部都要" (design + UX + code + design system), treat it as four deliverables and ship in that order.
+
+## 2) Produce Deliverables (pick what fits)
+Always be concrete: name components, states, spacing, typography, and interactions.
+
+- **UI concept + layout**: Provide a clear visual direction, grid, typography, color system, key screens/sections.
+- **UX flow**: Map the user journey, critical paths, error/empty/loading states, edge cases.
+- **Design system**: Tokens (color/typography/spacing/radius/shadow), component rules, accessibility notes.
+- **Implementation plan**: Exact file-level edits, component breakdown, and acceptance criteria.
+
+## 3) Use Bundled Assets
+This skill bundles data you can cite for inspiration/standards.
+
+- **Design intelligence data**: Read from `skills/ui-ux-pro-max/assets/data/` when you need palettes, patterns, or UI/UX heuristics.
+- **Upstream reference**: If you need more phrasing/examples, consult `skills/ui-ux-pro-max/references/upstream-skill-content.md`.
+
+## 4) Optional Script (Design System Generator)
+If you need to quickly generate tokens and page-specific overrides, use the bundled script:
+
+```bash
+python3 skills/ui-ux-pro-max/scripts/design_system.py --help
+```
+
+Prefer running it when the user wants a structured token output (ASCII-friendly).
+
+## Output Standards
+- Default to ASCII-only tokens/variables unless the project already uses Unicode.
+- Include: spacing scale, type scale, 2-3 font pair options, color tokens, component states.
+- Always cover: empty/loading/error, keyboard navigation, focus states, contrast.