Add architecture review and best-practices docs (#53)

Add comprehensive project documentation and a Supabase schema snapshot:
docs/01_CODEBASE_ARCHITECTURE_REVIEW.md and
docs/02_FEATURES_REQUIREMENTS_BEST_PRACTICES.md (detailed codebase
review, feature specs, and recommendations), plus supabase-table.json
(schema/table export). Also update .claude/settings.local.json to grant
the local Claude tool the mcp__claude_ai_Supabase__list_tables
permission for table listing.

Author: syed-reza98

.claude/settings.local.json

@@ -1,7 +1,8 @@
 {
   "permissions": {
     "allow": [
-      "Bash(flutter analyze *)"
+      "Bash(flutter analyze *)",
+      "mcp__claude_ai_Supabase__list_tables"
     ]
   }
 }