Phase 8a+8b: Pre-Commit-Hook fuer shared/-Drift + Audit-UI resource_id-Filter

Phase 8a (Hook):
- scripts/git-hooks/pre-commit: prueft bei Commits mit src/shared/-Aenderungen
  den Drift-Stand via sync_shared.py --check und gibt eine Warnung aus
  (blockiert NICHT - User entscheidet selbst, ob er zurueck will).
- scripts/install-hooks.sh: kopiert Hooks aus scripts/git-hooks/ nach
  .git/hooks/ (idempotent, ueberspringt user-eigene Hooks).

Phase 8b (Audit-UI):
- dashboard.html: Resource-ID Eingabefeld neben den anderen Audit-Filtern.
- audit.js: Filter-Listen erweitern, params um resource_id ergaenzt
  (Backend hatte den Filter seit Phase 5 schon).
- Damit ist die Audit-Spur einer einzelnen Ressource auch im Audit-Log-Tab
  filterbar (vorher nur per Direkt-URL bzw. per Quellen-Audit-Modal).

src/static/dashboard.html

@@ -393,6 +393,7 @@
           <select class="filter-select" id="auditFilterResource">
             <option value="">Alle Ressourcen</option>
           </select>
+          <input type="number" class="filter-select" id="auditFilterResourceId" placeholder="Ressourcen-ID" min="1" style="width:130px;">
           <select class="filter-select" id="auditFilterAdmin">
             <option value="">Alle Admins</option>
           </select>

src/static/js/audit.js

@@ -38,7 +38,7 @@ document.addEventListener("DOMContentLoaded", () => {
   });
 
   // Filter-Inputs verdrahten
-  ["auditFilterAction", "auditFilterResource", "auditFilterAdmin",
+  ["auditFilterAction", "auditFilterResource", "auditFilterResourceId", "auditFilterAdmin",
    "auditFilterFrom", "auditFilterTo"].forEach((id) => {
     const el = document.getElementById(id);
     if (el) el.addEventListener("change", () => { auditCache.offset = 0; loadAudit(); });
@@ -112,12 +112,14 @@ async function loadAudit() {
   const params = new URLSearchParams();
   const action = document.getElementById("auditFilterAction")?.value;
   const resource = document.getElementById("auditFilterResource")?.value;
+  const resourceId = document.getElementById("auditFilterResourceId")?.value;
   const adminId = document.getElementById("auditFilterAdmin")?.value;
   const from = document.getElementById("auditFilterFrom")?.value;
   const to = document.getElementById("auditFilterTo")?.value;
 
   if (action) params.append("action", action);
   if (resource) params.append("resource_type", resource);
+  if (resourceId) params.append("resource_id", resourceId);
   if (adminId) params.append("admin_id", adminId);
   if (from) params.append("from_ts", from);
   if (to) params.append("to_ts", to);