Migrate all repos into monorepo context folders

Bahn: aisupport, Analyse-O2C-C2S, awesome-bahn-mcp-servers, beam-mcp,
      Confluence_Bot, db-planet-mcp-server, O2C-Harness, project-audit,
      Projekt-KIQ-HP, teamlandkarte-mcp
Dhive: Jury-Voting
Privat: CV, NoteGraph (NOTE: NoteGraph needs complete redo after consolidation)
Shared: AI-Orchestrator, OrgMyLife, power_skills_and_more
Shared/references: symphony (read-only)

Bahn repos remain available as independent remotes - this monorepo
pulls them in via subtree, the originals are untouched.

bahn/project-audit/scripts/set-default-branch.py

@@ -0,0 +1,27 @@
+"""Stellt den Default Branch auf master um."""
+import urllib.request, json, ssl
+
+secrets = {}
+with open("project-audit/.secrets", "r", encoding="utf-8-sig") as f:
+    for line in f:
+        if "=" in line and not line.startswith("#"):
+            k, v = line.strip().split("=", 1)
+            secrets[k.strip()] = v.strip()
+
+TOKEN = secrets.get("GITLAB_TOKEN_AUDIT", "")
+ctx = ssl.create_default_context()
+ctx.check_hostname = False
+ctx.verify_mode = ssl.CERT_NONE
+
+url = "https://git.tech.rz.db.de/api/v4/projects/AndreKnie%2Fproject-audit"
+data = json.dumps({"default_branch": "master"}).encode("utf-8")
+req = urllib.request.Request(url, data=data, method="PUT")
+req.add_header("PRIVATE-TOKEN", TOKEN)
+req.add_header("Content-Type", "application/json")
+try:
+    resp = urllib.request.urlopen(req, context=ctx, timeout=15)
+    result = json.loads(resp.read().decode("utf-8"))
+    print(f"Default Branch jetzt: {result.get('default_branch', '?')}")
+    print("Erfolgreich umgestellt!")
+except Exception as e:
+    print(f"Fehler: {e}")