Initial commit: COPILOT D6 Flutter keyboard controller

Flutter web app replacing legacy WPF CCTV surveillance keyboard controller.
Includes wall overview, section view with monitor grid, camera input,
PTZ control, alarm/lock/sequence BLoCs, and legacy-matching UI styling.

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

Docs/legacy-architecture/mint.json

@@ -0,0 +1,43 @@
+{
+  "$schema": "https://mintlify.com/schema.json",
+  "name": "COPILOT D6 Legacy Architecture",
+  "logo": {
+    "light": "/logo/light.svg",
+    "dark": "/logo/dark.svg"
+  },
+  "favicon": "/favicon.png",
+  "colors": {
+    "primary": "#2563EB",
+    "light": "#60A5FA",
+    "dark": "#1D4ED8"
+  },
+  "navigation": [
+    {
+      "group": "Overview",
+      "pages": ["index"]
+    },
+    {
+      "group": "Architecture",
+      "pages": [
+        "architecture",
+        "hardware-input",
+        "ptz-control"
+      ]
+    },
+    {
+      "group": "Workflows",
+      "pages": [
+        "data-flows",
+        "configuration"
+      ]
+    },
+    {
+      "group": "Infrastructure",
+      "pages": [
+        "appserver",
+        "migration-comparison"
+      ]
+    }
+  ],
+  "mermaid": {}
+}