feat: Enterprise DSS architecture implementation

Complete implementation of enterprise design system validation:

Phase 1 - @dss/rules npm package:
- CLI with validate and init commands
- 16 rules across 5 categories (colors, spacing, typography, components, a11y)
- dss-ignore support (inline and next-line)
- Break-glass [dss-skip] for emergency merges
- CI workflow templates (Gitea, GitHub, GitLab)

Phase 2 - Metrics dashboard:
- FastAPI metrics API with SQLite storage
- Portfolio-wide metrics aggregation
- Project drill-down with file:line:column violations
- Trend charts and history tracking

Phase 3 - Local analysis cache:
- LocalAnalysisCache for offline-capable validation
- Mode detection (LOCAL/REMOTE/CI)
- Stale cache warnings with recommendations

Phase 4 - Project onboarding:
- dss-init command for project setup
- Creates ds.config.json, .dss/ folder structure
- Updates .gitignore and package.json scripts
- Optional CI workflow setup

Architecture decisions:
- No commit-back: CI uploads to dashboard, not git
- Three-tier: Dashboard (read-only) → CI (authoritative) → Local (advisory)
- Pull-based rules via npm for version control

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

packages/dss-rules/rules/colors.json

@@ -10,11 +10,11 @@
     {
       "id": "no-hardcoded-colors",
       "name": "No Hardcoded Colors",
-      "description": "All colors must use design tokens, not hardcoded hex/rgb values",
+      "description": "Colors must use design tokens, not hardcoded hex/rgb values",
       "severity": "error",
       "patterns": {
         "forbidden": [
-          "#[0-9a-fA-F]{3,8}",
+          "#[0-9a-fA-F]{3,8}(?![0-9a-fA-F])",
           "rgb\\([^)]+\\)",
           "rgba\\([^)]+\\)",
           "hsl\\([^)]+\\)",
@@ -27,11 +27,7 @@
           "theme\\.[a-z]+"
         ]
       },
-      "exceptions": [
-        "*.test.*",
-        "*.spec.*",
-        "**/fixtures/**"
-      ]
+      "exceptions": ["*.test.*", "*.spec.*", "**/fixtures/**", "transparent", "inherit", "currentColor"]
     },
     {
       "id": "semantic-color-naming",
@@ -56,20 +52,7 @@
     }
   ],
   "tokens": {
-    "required": [
-      "colors.primary",
-      "colors.secondary",
-      "colors.background",
-      "colors.foreground",
-      "colors.border",
-      "colors.error",
-      "colors.success",
-      "colors.warning"
-    ],
-    "optional": [
-      "colors.muted",
-      "colors.accent",
-      "colors.info"
-    ]
+    "required": ["colors.primary", "colors.secondary", "colors.background", "colors.foreground", "colors.border", "colors.error", "colors.success", "colors.warning"],
+    "optional": ["colors.muted", "colors.accent", "colors.info"]
   }
 }