feat: remove start.sh script and add appearance preferences management

- Deleted the start.sh script for container management.
- Added AGENTS.md for project guidelines and development principles.
- Introduced new SQL migration files for user appearance preferences and platform settings.
- Implemented appearance provider to manage user interface themes and preferences.
- Created branding utility to define and manage branding-related constants and types.

Co-authored-by: Copilot <copilot@github.com>

drizzle/meta/_journal.json

@@ -15,13 +15,41 @@
       "when": 1775356013998,
       "tag": "0001_supreme_the_enforcers",
       "breakpoints": true
-    }
-    ,{
+    },
+    {
       "idx": 2,
       "version": "7",
       "when": 1775400000000,
       "tag": "0002_tax_deductible",
       "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "7",
+      "when": 1775600000000,
+      "tag": "0003_appearance_preferences",
+      "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1777336000000,
+      "tag": "0004_platform_appearance_controls",
+      "breakpoints": true
+    },
+    {
+      "idx": 5,
+      "version": "7",
+      "when": 1777337000000,
+      "tag": "0005_platform_settings_and_roles",
+      "breakpoints": true
+    },
+    {
+      "idx": 6,
+      "version": "7",
+      "when": 1777338000000,
+      "tag": "0006_pdf_generation_settings",
+      "breakpoints": true
     }
   ]
-}
+}