feat(consent-tester): Phase B — named CMP library + plugin architecture

cmp_extractor.py refactored to thin coordinator (123 LOC, was 223).
Discovers all CMP modules via cmp_library/_registry.py:load_all() at
import time. Restart consent-tester to pick up new modules.

New cmp_library/ folder:
- _registry.py: auto-discovers all modules with MATCHER + reconstruct()
- epaas.py:     BMW Group ePaaS (extracted from cmp_extractor)
- onetrust.py:  cdn.cookielaw.org Groups/Cookies schema
- cookiebot.py: consent.cookiebot.com Categories schema
- usercentrics.py: api.usercentrics.eu services schema
- didomi.py:    sdk.privacy-center.org notice + vendors + purposes
- trustarc.py:  consent.trustarc.com categories + vendors

Each module:
- MATCHER: re.Pattern matching the CMP JSON endpoint URL
- reconstruct(d: dict) -> str: builds German Markdown cookie-policy text

Phase E (self-improving) will write auto_*.py files into the same folder;
_registry already picks those up via pkgutil.iter_modules.

consent-tester/services/cmp_library/didomi.py

@@ -0,0 +1,51 @@
+"""Didomi CMP.
+
+URLs:
+  - sdk.privacy-center.org/<id>/notice/<lang>.json
+  - api.privacy-center.org/v1/notices/...
+Schema: app.vendors[], app.purposes[], notice texts
+"""
+
+import re
+
+MATCHER = re.compile(
+    r"(?:sdk|api)\.privacy-center\.org/.+/notice[s]?/.*\.json(?:\?|$)", re.I,
+)
+
+
+def reconstruct(d: dict) -> str:
+    parts: list[str] = ["# Cookie-Richtlinie (Didomi)"]
+
+    app = d.get("app", d) or {}
+    notice = d.get("notice", {}) or app.get("notice", {}) or {}
+    for key in ("content", "title", "subtitle"):
+        v = notice.get(key)
+        if v:
+            parts.append("")
+            parts.append(str(v))
+
+    purposes = app.get("purposes") or d.get("purposes") or []
+    if purposes:
+        parts.append("")
+        parts.append("## Zwecke")
+        for p in purposes:
+            name = p.get("name") or p.get("id") or ""
+            desc = p.get("description") or ""
+            parts.append(f"- {name}: {desc[:200]}")
+
+    vendors = app.get("vendors") or d.get("vendors") or []
+    if vendors:
+        parts.append("")
+        parts.append(f"## Anbieter ({len(vendors)})")
+        for v in vendors[:80]:
+            name = v.get("name") or ""
+            country = v.get("country") or ""
+            policy = v.get("policyUrl") or ""
+            line = f"- {name}"
+            if country:
+                line += f" — Sitz: {country}"
+            if policy:
+                line += f" — Datenschutz: {policy}"
+            parts.append(line)
+
+    return "\n".join(parts)