refactor: restructure project for multi-agent extensibility

- Migrate source to packages/client and packages/server directories
- Namespace all Hermes-specific code under hermes/ subdirectories
  (api/hermes/, components/hermes/, views/hermes/, stores/hermes/)
- Add hermes.* route names and /hermes/* path prefixes
- Upgrade @koa/router to v15, adapt path-to-regexp v8 syntax
- Fix proxy path rewriting: /api/hermes/v1/* → /v1/*, /api/hermes/* → /api/*
- Fix frontend API paths to match backend /api/hermes/* routes
- Fix WebSocket terminal path to /api/hermes/terminal
- Add proxyMiddleware for reliable unmatched route proxying
- Add profiles route module and hermes-cli profile commands
- Update CLAUDE.md development guide with new architecture
- Add Chinese README (README_zh.md)
- Add Web Terminal feature to README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/styles/variables.scss

@@ -0,0 +1,57 @@
+// 黑白水墨 — Pure Ink
+// 纯黑白灰，无彩色
+
+// Backgrounds
+$bg-primary: #fafafa;
+$bg-secondary: #f0f0f0;
+$bg-sidebar: #f5f5f5;
+$bg-card: #ffffff;
+$bg-card-hover: #fafafa;
+$bg-input: #ffffff;
+
+// Borders
+$border-color: #e0e0e0;
+$border-light: #ebebeb;
+
+// Accent
+$accent-primary: #333333;
+$accent-hover: #1a1a1a;
+$accent-muted: #888888;
+
+// Text
+$text-primary: #1a1a1a;
+$text-secondary: #666666;
+$text-muted: #999999;
+
+// Status
+$success: #2e7d32;
+$error: #c62828;
+$warning: #f57f17;
+$info: $accent-primary;
+
+// Message bubbles
+$msg-user-bg: #e8e8e8;
+$msg-assistant-bg: #f5f5f5;
+$msg-system-border: #bdbdbd;
+
+// Code
+$code-bg: #f4f4f4;
+
+// Typography
+$font-ui: 'Inter', system-ui, -apple-system, sans-serif;
+$font-code: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
+
+// Layout
+$sidebar-width: 240px;
+$sidebar-collapsed-width: 64px;
+$header-height: 60px;
+$breakpoint-mobile: 768px;
+
+// Radius
+$radius-sm: 6px;
+$radius-md: 10px;
+$radius-lg: 14px;
+
+// Transition
+$transition-fast: 0.15s ease;
+$transition-normal: 0.25s ease;