refactor+feat: Snapshot-Router-Split + generischer ChecklistAgent + AGB-Modul

- Item 2: Snapshot-Doc-Checks (cookie/impressum/dse/agb) in snapshot_check_routes.py
  (agent_compliance_check_routes.py 464→365 Z.); gleiche Pfade, in main.py registriert.
- ChecklistAgent-Basis: DSE-Logik generalisiert (L1/L2, kurze Titel, _severity_
  override-Hook). DSEAgent + AGBAgent sind jetzt Thin-Subclasses → künftige
  Doc-Agenten (widerruf/avv/…) trivial.
- Item 4: AGBAgent (§§ 305 ff. BGB, AGB_CHECKLIST) + agb-check + AGB-Tab via
  AgentModuleTab. Kein Library-Firehose.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-compliance/compliance/api/agent_compliance_check_routes.py

@@ -223,105 +223,6 @@ async def get_snapshot(snapshot_id: str):
         db.close()
 
 
-@router.get("/snapshots/{snapshot_id}/cookie-check")
-async def snapshot_cookie_check(snapshot_id: str):
-    """Pro-Cookie-Abgleich der Snapshot-Vendors gegen cookie_knowledge_db."""
-    from fastapi import HTTPException
-    from database import SessionLocal
-    from compliance.services.check_snapshot import load_snapshot
-    from compliance.services.cookie_library_check import (
-        analyze_cookies, load_big_library,
-    )
-    from compliance.services.cookie_storage_inventory import (
-        build_storage_inventory, storage_transparency_finding,
-    )
-    from compliance.services.cookie_compliance_audit import (
-        audit_cookie_compliance,
-    )
-    db = SessionLocal()
-    try:
-        snap = load_snapshot(db, snapshot_id)
-        if not snap:
-            raise HTTPException(status_code=404, detail="snapshot not found")
-        vendors = snap.get("cmp_vendors") or []
-        names = [c.get("name", "")
-                 for v in vendors for c in (v.get("cookies") or [])]
-        big = load_big_library(db, names)
-        out = analyze_cookies(vendors, big)
-        inv = build_storage_inventory(vendors)
-        tf = storage_transparency_finding(inv)
-        if tf:
-            out["findings"].insert(0, tf)
-            out["summary"]["findings"] = len(out["findings"])
-        out["storage_inventory"] = inv
-        # ② Documentation Drift: Cookie-Richtlinie (Text) vs. Browser-Realität.
-        docs = snap.get("doc_entries") or []
-        cookie_text = next(
-            (e.get("text") or e.get("content") or "" for e in docs
-             if e.get("doc_type") in ("cookie", "cookie_richtlinie", "cookies")),
-            "",
-        )
-        out["drift"] = audit_cookie_compliance(
-            db, cookie_text, snap.get("banner_result"))
-        return out
-    finally:
-        db.close()
-
-
-@router.get("/snapshots/{snapshot_id}/impressum-check")
-async def snapshot_impressum_check(snapshot_id: str):
-    """Impressum-Analyse aus dem Snapshot (kein Re-Crawl): laeuft den v3
-    ImpressumAgent auf dem gespeicherten Impressum-Text + Profil/Scope und
-    liefert den AgentOutput (Findings/Massnahmen/MC-Coverage) fuer den Tab."""
-    from fastapi import HTTPException
-    from database import SessionLocal
-    from compliance.services.check_snapshot import load_snapshot
-    from compliance.services.specialist_agents import REGISTRY, AgentInput
-    from compliance.api.agent_check._agent_outputs import (
-        impressum_input_from_snapshot,
-    )
-    db = SessionLocal()
-    try:
-        snap = load_snapshot(db, snapshot_id)
-        if not snap:
-            raise HTTPException(status_code=404, detail="snapshot not found")
-        agent_input = impressum_input_from_snapshot(snap)
-        if not agent_input:
-            return {"findings": [], "recommendations": [], "mc_coverage": [],
-                    "notes": "kein Impressum-Text im Snapshot", "confidence": 0.0}
-        out = await REGISTRY.get("impressum").evaluate(AgentInput(**agent_input))
-        return out.model_dump(mode="json")
-    finally:
-        db.close()
-
-
-@router.get("/snapshots/{snapshot_id}/dse-check")
-async def snapshot_dse_check(snapshot_id: str):
-    """DSE-Analyse aus dem Snapshot (kein Re-Crawl): laeuft den kuratierten
-    DSEAgent (Art. 13/14, ART13_CHECKLIST — KEIN Library-Firehose) auf dem
-    gespeicherten DSE-Text und liefert den AgentOutput fuer den Tab."""
-    from fastapi import HTTPException
-    from database import SessionLocal
-    from compliance.services.check_snapshot import load_snapshot
-    from compliance.services.specialist_agents import REGISTRY, AgentInput
-    from compliance.api.agent_check._agent_outputs import (
-        doc_input_from_snapshot,
-    )
-    db = SessionLocal()
-    try:
-        snap = load_snapshot(db, snapshot_id)
-        if not snap:
-            raise HTTPException(status_code=404, detail="snapshot not found")
-        agent_input = doc_input_from_snapshot(snap, "dse")
-        if not agent_input:
-            return {"findings": [], "recommendations": [], "mc_coverage": [],
-                    "notes": "kein DSE-Text im Snapshot", "confidence": 0.0}
-        out = await REGISTRY.get("dse").evaluate(AgentInput(**agent_input))
-        return out.model_dump(mode="json")
-    finally:
-        db.close()
-
-
 @router.get("/admin/benchmark")
 async def benchmark(
     industry: str = "",