chore: Add Claude Code project configuration

Add .claude directory with settings and memory files for
consistent AI-assisted development.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/mcp/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}