chore(git): add conventional commit hooks and template

Add commit-msg hook, .gitmessage, and setup script. Ignore .cursor/ in gitignore and lower contact rate limit to 5 per hour.

Co-authored-by: Cursor <cursoragent@cursor.com>

.githooks/commit-msg

@@ -0,0 +1,29 @@
+#!/bin/sh
+# Validiert Commit-Messages nach Conventional Commits
+# https://www.conventionalcommits.org/
+
+commit_msg_file="$1"
+
+first_line=$(sed '/^#/d;/^$/d' "$commit_msg_file" | head -n 1)
+
+# Merge/Revert von Git erlauben
+case "$first_line" in
+  Merge\ *|Revert\ *)
+    exit 0
+    ;;
+esac
+
+pattern='^(feat|fix|docs|style|refactor|perf|test|build|ci|chore)(\([a-z0-9._-]+\))?!?: .+'
+
+if ! printf '%s\n' "$first_line" | grep -qE "$pattern"; then
+  echo >&2 "❌ Commit-Message entspricht nicht Conventional Commits."
+  echo >&2 ""
+  echo >&2 "  Format:  type(scope): description"
+  echo >&2 "  Beispiel: feat(products): hide vpc in navigation"
+  echo >&2 ""
+  echo >&2 "  Erlaubte types: feat, fix, docs, style, refactor, perf, test, build, ci, chore"
+  echo >&2 "  Überspringen: git commit --no-verify"
+  exit 1
+fi
+
+exit 0