docs: update CLAUDE.md with detailed project structure and conventions

- Add comprehensive architecture documentation with all component folders
- Document placement conventions for blocks, editor panels, UI components
- Add CI/CD deployment details and excluded files
- Remove donorbox cache file from repository

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

.claude/settings.local.json

@@ -11,7 +11,10 @@
       "WebFetch(domain:docs.snipcart.com)",
       "WebFetch(domain:www.mondialrelay.fr)",
       "WebFetch(domain:storage.mondialrelay.fr)",
-      "WebFetch(domain:jsfiddle.net)"
+      "WebFetch(domain:jsfiddle.net)",
+      "Bash(tree:*)",
+      "Bash(git add:*)",
+      "Bash(git commit:*)"
     ],
     "deny": [],
     "ask": []