release: v1.1.0 — prompt patterns, CHANGELOG-driven release notes

- Prompt Builder: 12 named patterns (Direct/Reasoning/Agentic + Auto), live
  per-pattern hints in popup and in-page dialog, legacy promptStyle migration,
  and a 2048-token floor fix so longer patterns stop getting truncated.
- CHANGELOG.md added (Keep a Changelog + SemVer); release.yml now builds the
  Gitea release body from the matching version section, with a generic
  fallback, plus a zip-root fix so manifest.json sits at the archive root.
- package.json/package-lock.json bumped to 1.1.0; CLAUDE.md documents the
  CHANGELOG-gated release process.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lexai",
-  "version": "1.0.2",
+  "version": "1.1.0",
   "description": "A Grammarly-like Chrome Extension powered by your own LLM provider and API key",
   "engines": {
     "node": ">=22"