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-carousel/SKILL.md

@@ -0,0 +1,77 @@
+---
+name: social-carousel
+description: 小红书选辑 / anthology 横滚社交模板 — 8 张竖卡连续 auto-scroll snap loop，每张几何裁切 mask（拱 / 椭 / 半穹顶 / 斜）+ 宋体标题 + 一个 SVG 装饰符号 + 角部期号元数据。用于摄影系列 / 艺术指导 / mood reel / 品牌瞬间集 (6-10 帧)。触发："做个 anthology 选辑 / 横滚画廊 / mood reel / 摄影系列展 / 第 0X 辑封面集"。NOT 教程类（用 digital-eguide），NOT < 4 张系列，NOT 文字密集卡（横滚速度藏文字）。
+visibility: public
+mode: template
+carrier: fixed-image
+scenario: social-content
+pattern_source: scroll-gallery.html
+source_priority: skill-first
+triggers:
+  - "做个 anthology 选辑"
+  - "横滚画廊"
+  - "mood reel"
+  - "摄影系列展"
+  - "第 0X 辑封面集"
+  - "auto-scroll 卡集"
+related_patterns: social-card-image-led, digital-eguide
+---
+
+# Social Carousel Template
+
+Use this template when the artifact is a **curated multi-card anthology** — 6–10 images that share an editorial identity and want to be experienced in rhythm, not as a list.
+
+Distinct from `digital-eguide/social-carousel.html` (12-frame field-notes guide with 50/50 photo + metadata). This one is **gallery-paced**, no per-card metadata table, sculptural geometric masks.
+
+## Use When
+
+- The user wants to publish a **series / anthology / 选辑 / collection** — photography, art direction, branding moments, mood reel.
+- Each card carries one image + a short serif title + a volume number (第 0X 辑).
+- The viewing context is browsing / pause / browse — not step-by-step instruction.
+- The output is a fixed-image set (HTML-to-image) or an embedded auto-scrolling strip.
+
+## Avoid When
+
+- The content is a tutorial or numbered steps — use `digital-eguide/social-carousel.html` (it has progress + per-step metadata) or `social-card-swiss/`.
+- The series is < 4 entries — make individual cards instead.
+- The content is text-heavy (quotes, body copy) — gallery rhythm hides text.
+- The platform expects discrete swipeable posts (XHS multi-image post) — this is one scrolling strip, not 9 separate posts.
+
+## Required Reading
+
+Read this `SKILL.md` first. Do **not** read `scroll-gallery.html` by default.
+
+Read `scroll-gallery.html` only when you need: the geometric-mask shapes (arch / oval / half-dome / diagonal), the auto-scroll easing values, the seamless-loop double-render trick, or the hover-slowdown behavior. Extract patterns; do not copy the placeholder Songti titles, photo URLs, or class names wholesale.
+
+## Design Strategy
+
+Commit to the anthology spine before designing cards:
+
+- one cover frame role per card (full-bleed, arched, oval, diagonal, masked half-dome)
+- a single rotating ornamental SVG mark style (don't mix flower + grid + arrow)
+- consistent corner metadata (volume + tag + year, picked once)
+- one title font (Songti SC), one meta font (PingFang SC), no third voice
+
+If the cards don't share a visual system, the auto-scroll exposes the inconsistency.
+
+## Layout Bias
+
+Prefer:
+
+- 2:3 or 7:9 portrait per card; mix sparingly, never randomly
+- restrained warm palette (creams / terracottas / sage) over white or near-black
+- one geometric mask per card, rotated through the set
+- ornamental marks small and consistent, in a single accent ink
+- continuous slow auto-scroll, pause on hover, infinite loop
+
+Avoid:
+
+- emoji or 3D plastic stickers in corner metadata
+- mixing portrait + landscape card aspects randomly
+- adding step numbers (this is not a tutorial)
+- decorative gradients behind images — the mask is the decoration
+- 黑金 / neon palettes — the template's identity is editorial / warm
+
+## Platform / Size
+
+A horizontal strip of vertical cards (~ 360×540 each). Designed for embedding on a long page or capturing as a wide image. If the user wants discrete XHS posts, export each card individually.