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-editorial/SKILL.md

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+---
+name: social-card-editorial
+description: 杂志感 / 电子墨水风社交卡 — 纸感留白、张力标题、克制装饰；卡角色含封面 / 期号封面 / 引言 / 编辑型短文分栏 / field note 照片 / 证据特写 / 结语 / 章节分隔 / hero 问句。用于观点 / 书摘 / 旅行 / 生活方式 / 文化 / 品牌故事 / 深度解释。触发："做个杂志感卡 / 公众号封面 / 留白卡 / 编辑型卡 / 引言卡"。NOT 强运营 KPI 卡，NOT cyber/工业科技调，NOT 商业大字海报。
+visibility: public
+mode: template
+carrier: fixed-image
+scenario: social-content
+pattern_source: pattern.html
+source_priority: skill-first
+triggers:
+  - "做个杂志感卡"
+  - "公众号封面"
+  - "留白卡"
+  - "编辑型卡"
+  - "引言卡"
+  - "电子墨水风卡"
+  - "纸感卡"
+related_patterns: social-card-quote, social-card-image-led
+---
+
+# Social Card Editorial Template
+
+Use this template for social cards that should feel editorial, literary, reflective, premium, or magazine-like.
+
+## Use When
+
+- 小红书 / 公众号 / 社媒封面需要杂志感、纸感、留白、标题张力。
+- 内容是观点、书摘、旅行、生活方式、文化、品牌故事、深度解释。
+- 图片、引用、标题、短段落需要共同构成一张“可保存”的卡片。
+- The artifact is fixed-canvas and will be delivered as HTML-to-image.
+
+## Avoid When
+
+- The card is highly operational, KPI-heavy, or dashboard-like.
+- The content needs dense tables, multiple metrics, or system UI explanation.
+- The user asks for a loud commercial poster or cyber/industrial tech look.
+
+## Required Reading
+
+Read this `SKILL.md` first. Do **not** read `pattern.html` by default.
+
+Read `pattern.html` only if you need to inspect visual rhythm or layout relationships. When read, extract patterns only; do not copy DOM, CSS classes, exact spacing, placeholder copy, or WebGL behavior wholesale.
+
+## Design Strategy
+
+This template offers an editorial stance, not a fixed layout. Start from the current brief and choose one card role:
+
+- cover / issue cover
+- pull quote / thesis
+- editorial essay split
+- field note photo
+- evidence feature
+- closing note
+- section divider
+- hero question
+
+Then adapt the card around the chosen role.
+
+## Layout Bias
+
+Prefer:
+
+- large title blocks with intentional line breaks
+- paper-like background or quiet monochrome surfaces
+- hairline rules, issue strips, captions, marginal notes
+- one strong image crop or one dominant quote
+- restrained accent marks rather than decorative stickers
+
+Avoid:
+
+- generic rounded card grids
+- under-filled portrait canvases
+- treating photos as small decorative thumbnails
+- adding ornamental Chinese motifs without content reason
+
+## Platform / Size
+
+Use `canvas-and-device.md` to select the exact output size. For Xiaohongshu/RED, WeChat covers, or other platform-specific surfaces, do not hard-code sizes in this template.