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/design/design-templates/social-card-image-led/SKILL.md

@@ -0,0 +1,59 @@
+---
+name: social-card-image-led
+description: 图片主导的社交卡 — 图是证据 / 氛围 / 产品 / 物件 / 地点 / 钩子，文字让位。骨架：全出血 + 安全标题块 / 大图井 + 编辑标题 / 图片裁切 + caption 账本 / 产品物件照 + 三个证据点 / 旅行地点 + 地图或位置元数据。必须保护人脸 / 产品 / UI / 关键细节不被文字盖住。触发："做个图片卡 / 照片封面 / 产品图卡 / 旅行卡 / 物件卡 / 证据图卡"。NOT 没图片只能补 stock 装饰，NOT 用蒙版强行救烂图。
+visibility: public
+mode: template
+carrier: fixed-image
+scenario: social-content
+pattern_source: pattern.html
+source_priority: skill-first
+triggers:
+  - "做个图片卡"
+  - "照片封面"
+  - "产品图卡"
+  - "旅行卡"
+  - "物件卡"
+  - "证据图卡"
+  - "全出血图卡"
+related_patterns: social-card-editorial
+---
+
+# Social Card Image-Led Template
+
+Use when the image is the evidence, mood, product, object, place, or hook.
+
+## Core Rule
+
+The image must do real work. If it is only decoration, choose another template.
+
+## Structure Options
+
+- full-bleed image + safe title block
+- large image well + editorial title
+- image crop + caption ledger
+- product/object photo + three evidence points
+- travel/place image + map or location metadata
+
+## Must Do
+
+- Protect faces, products, UI, and important image details from text overlay.
+- Use overlays only when contrast is genuinely needed.
+- Keep title and image in a clear relationship.
+- If image quality is poor, crop less aggressively or switch to a text-led recipe.
+
+## Avoid
+
+- Text covering faces or key product areas.
+- Dark overlay as a lazy fix for all images.
+- Decorative stock image with no content relation.
+- Tiny image thumbnails on a portrait canvas.
+
+## Related Pattern
+
+Use `social-card-editorial` as the closest pattern if a visual reference is needed.
+
+## Pattern Source Rule
+
+Read this `SKILL.md` first. Do **not** read `pattern.html` by default.
+
+Read `pattern.html` only when you need concrete layout rhythm, spatial relationships, or interaction/annotation behavior that this markdown cannot fully specify. When read, extract patterns only; do not copy DOM, CSS classes, exact spacing, placeholder copy, or styling wholesale.