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/web-shader-extractor/references/tsl-extraction.md

@@ -0,0 +1,41 @@
+# Three.js TSL 识别与重建
+
+Three.js r170+ 的 TSL (Three Shading Language) 用 JS 函数调用链组合 shader 节点图，运行时编译为 GLSL。
+
+## 识别信号
+
+1. Bundle 有大量 `uniform`/`shader` 但几乎没有 `precision`/`gl_FragColor`
+2. canvas `data-engine` 显示 r170+
+3. 存在 `.mul()`/`.add()`/`.toVar()`/`.assign()` 链式调用
+
+## TSL → GLSL 映射
+
+| TSL | GLSL |
+|-----|------|
+| `screenUV` | `gl_FragCoord.xy / resolution` |
+| `viewportSize` | `uniform vec2 resolution` |
+| `float()`/`vec2()`/`vec3()`/`vec4()` | 同名（但 TSL 中是 JS 函数） |
+| `.mul()`/`.add()`/`.sub()`/`.div()` | `*`/`+`/`-`/`/` |
+| `sin()`/`cos()`/`mix()`/`smoothstep()` | 同名 |
+| `clamp()`/`abs()`/`fract()`/`floor()` | 同名 |
+| `pow()`/`exp()`/`sqrt()`/`dot()`/`length()` | 同名 |
+| `Fn()` | shader 函数包裹器（内联到 GLSL） |
+| `uniform()` | `uniform <type> name` |
+| `convertToTexture()` | RTT（多 pass 渲染） |
+| `.sample(uv)` | `texture(sampler, uv)` |
+| `.toVar()`/`.assign()` | 声明/赋值可变变量 |
+| `.oneMinus()` | `1.0 - x` |
+
+## 重建步骤
+
+1. **定位**：搜索组件名附近的 `fragmentNode` 属性
+2. **映射表**：从 bundle 顶部 import 语句推断 minified → TSL 函数名
+   ```javascript
+   import { A as screenUV, W as sin, ... } from "three-module"
+   ```
+3. **翻译**：链式调用 → GLSL 表达式
+   ```javascript
+   // TSL: screenUV.x.sub(center.x).mul(aspect)
+   // GLSL: (uv.x - center.x) * aspect
+   ```
+4. **RTT**：`convertToTexture(childNode)` → 独立 pass 渲染到 FBO，主 shader 中 `texture()` 采样