fix(admin): resolve all 266 TypeScript errors, enable strict build

Eliminate the pre-existing TS errors that were masked by
next.config.js `typescript.ignoreBuildErrors: true`, then turn the flag
OFF so the compiler is a real safety net for future changes. `next build`
and `tsc --noEmit` now pass with 0 errors.

The errors were not cosmetic — several exposed real latent bugs hidden by
the flag, e.g. the drafting-engine ConstraintEnforcer read non-existent
fields (`t.rule.dsfaRequired`, `d.required`, `r.title`), so its DSFA hard
gate and risk-flag checks were silently no-ops; scopeDefaults read
snake_case CompanyProfile fields that never matched the camelCase type
(generator defaults never populated). Both fixed by aligning code to the
current types.

Highlights:
- Vitest globals: add vitest-globals.d.ts (config already had globals:true)
  so the test files type-check; exclude Playwright specs from vitest.
- Add a minimal ambient `pg` module declaration (no @types/pg installed).
- Fix Next 15 route handlers to await Promise params.
- Reconcile drifted types across loeschfristen, compliance-scope, document-
  generator, drafting-engine, vendor-compliance, agent and more.

Pre-existing (NOT caused here, proven by stashing the diff): 3 vitest
logic tests still fail — getNextStep (2) and buildDocumentScope priority (1).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

admin-compliance/app/sdk/loeschfristen/_components/EditorSectionsB.tsx

@@ -55,7 +55,7 @@ export function DeletionLogicSection({
       {policy.deletionTrigger === 'RETENTION_DRIVER' && (
         <div>
           <label className="block text-sm font-medium text-gray-700 mb-1">Aufbewahrungstreiber</label>
-          <select value={policy.retentionDriver}
+          <select value={policy.retentionDriver ?? ""}
             onChange={(e) => {
               const driver = e.target.value as RetentionDriverType
               const meta = RETENTION_DRIVER_META[driver]
@@ -78,13 +78,13 @@ export function DeletionLogicSection({
       <div className="grid grid-cols-2 gap-4">
         <div>
           <label className="block text-sm font-medium text-gray-700 mb-1">Aufbewahrungsdauer</label>
-          <input type="number" min={0} value={policy.retentionDuration}
+          <input type="number" min={0} value={policy.retentionDuration ?? ""}
             onChange={(e) => set('retentionDuration', parseInt(e.target.value) || 0)}
             className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-purple-500" />
         </div>
         <div>
           <label className="block text-sm font-medium text-gray-700 mb-1">Einheit</label>
-          <select value={policy.retentionUnit} onChange={(e) => set('retentionUnit', e.target.value as RetentionUnit)}
+          <select value={policy.retentionUnit ?? ""} onChange={(e) => set('retentionUnit', e.target.value as RetentionUnit)}
             className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-purple-500">
             <option value="DAYS">Tage</option>
             <option value="MONTHS">Monate</option>
@@ -232,7 +232,7 @@ export function StorageSection({
                       className="text-purple-600 focus:ring-purple-500 rounded" />
                   </td>
                   <td className="px-3 py-2">
-                    <input type="text" value={loc.provider}
+                    <input type="text" value={loc.provider ?? ""}
                       onChange={(e) => updateStorageLocationItem(idx, (s) => ({ ...s, provider: e.target.value }))}
                       placeholder="Anbieter"
                       className="w-full px-2 py-1 border border-gray-200 rounded text-sm focus:ring-1 focus:ring-purple-500" />