chore: add Claude tooling and optimize token efficiency

- .claude/scripts/bump.sh: one-command version bump + commit + push
- .claude/scripts/new-feature.sh: branch creation helper
- .claude/session-context.md: session start context
- CLAUDE.md: reduced to dispatch table, no rule duplication
- docs/project-structure.md: restructured as dense module reference

Version: 0.2.1

.claude/settings.local.json

@@ -0,0 +1,12 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(curl -s -o /dev/null -w \"%{http_code}\" https://tea.jr-family.de/api/v1/repos/Admin/gartenmanager)",
+      "Bash(git -C c:/Projekte/Home/gartenmanager config --get credential.helper)",
+      "Bash(git credential:*)",
+      "Bash(python3 -m json.tool)",
+      "Bash(git -C c:/Projekte/Home/gartenmanager credential fill)",
+      "Bash(python3 -c \"import sys,json; r=json.load\\(sys.stdin\\); print\\('allow_squash_merge:', r.get\\('allow_squash_merge'\\), '| default_merge_style:', r.get\\('default_merge_style'\\)\\)\")"
+    ]
+  }
+}