[POLISH] Docker setup fix + UI polish + project completion

- Fix Docker: add php.ini, correct env var names (DB_NAME/DB_USER/DB_PASS),
  add 002_email_log.sql to initdb, add Authorization header passthrough,
  add uploads volume, install opcache, create .dockerignore
- UI polish: page fade-in transitions, skeleton loader CSS, staggered card
  animations, mobile sidebar backdrop overlay, keyboard focus-visible styles,
  button loading state, tooltip system, alert banners, tab component,
  custom scrollbar, print styles, clickable table rows
- Add setButtonLoading() and _toggleSidebar() helpers to common.js
- Update CLAUDE.md to reflect 100% project completion

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

.dockerignore

@@ -0,0 +1,26 @@
+# Git
+.git
+.gitignore
+
+# Environment & credentials
+.env
+docs/credentials/
+
+# IDE
+.vscode/
+.idea/
+
+# OS files
+Thumbs.db
+.DS_Store
+
+# Docker (avoid recursive copy)
+docker/
+
+# Documentation (not needed in image)
+CLAUDE.md
+*.md
+
+# Temp files
+*.log
+*.tmp