docs: add Claude AI assistant rules and configuration

Add comprehensive rule documentation for AI-assisted development covering
authentication surfaces, outbound-call safety invariants, and other project
conventions to guide Claude's understanding of critical system behaviors.

dashboard/package-lock.json

@@ -13,6 +13,7 @@
         "@sveltejs/vite-plugin-svelte": "^5.0.3",
         "@tailwindcss/vite": "^4.1.3",
         "@types/node": "^25.8.0",
+        "daisyui": "^5.0.0",
         "svelte": "^5.25.3",
         "svelte-check": "^4.1.4",
         "tailwindcss": "^4.1.3",
@@ -1262,6 +1263,16 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/daisyui": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/daisyui/-/daisyui-5.7.0.tgz",
+      "integrity": "sha512-2/kYbxaKtv349lPrTyxMKC9SHsyA7fBULMSabJljDE82D079cjqz+UyAzsogWgy4sTs5NDvD000acfcFqbO1XA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/saadeghi/daisyui?sponsor=1"
+      }
+    },
     "node_modules/debug": {
       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",