Add Claude Code skills for web frontend frameworks

- Add Svelte 3/4 skill covering components, reactivity, stores, lifecycle
- Add Rollup skill covering configuration, plugins, code splitting
- Add nostr-tools skill covering event creation, signing, relay communication
- Add applesauce-core skill covering event stores, reactive queries
- Add applesauce-signers skill covering NIP-07/NIP-46 signing abstractions
- Update .gitignore to include .claude/** directory

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitignore

@@ -79,6 +79,7 @@ cmd/benchmark/data
 !*.svelte
 !.github/**
 !.github/workflows/**
+!.claude/**
 !app/web/dist/**
 !app/web/dist/*.js
 !app/web/dist/*.js.map