Initial import: shopdb-flask multi-site asset platform

Flask + Vue rewrite of the classic-ASP shopdb, built as a plugin
framework so sister GE Aerospace sites can adopt it. Product version
0.7.0-pre-0.8.0, plugin contract 0.11.0, 966 backend tests.

Key entry points:
- docs/INSTALL-WINDOWS-IIS.md - tested Windows + IIS install runbook
  (own-site and subpath deployment methods)
- docs/PILOT-DEPLOY.md - production pilot: stand up + import + verify
- docs/IMPORT-API.md - schema-agnostic legacy data import contract
- scripts/site_imports/wjf/ - West Jefferson reference import loader
- docs/adr/ - twelve accepted architecture decision records

frontend/src/views/settings/AuditSettings.vue

@@ -0,0 +1,51 @@
+<template>
+  <div>
+    <div class="page-header">
+      <h2>Audit &amp; Logging</h2>
+    </div>
+
+    <div class="section-card">
+      <div class="setting-group">
+        <h3>Audit Log Retention</h3>
+        <p class="setting-description">
+          Configure how long audit logs are retained. Older logs will be automatically purged.
+          Set to 0 to keep logs indefinitely.
+        </p>
+
+        <div class="setting-row">
+          <label>
+            <span>Retention Period (days)</span>
+            <input
+              type="number"
+              v-model="settings.audit_retention_days"
+              min="0"
+              placeholder="90"
+              @blur="saveSetting('audit_retention_days', settings.audit_retention_days)"
+              :disabled="saving"
+            >
+            <small class="input-hint">0 = keep forever, recommended: 90 days</small>
+          </label>
+        </div>
+
+        <router-link to="/settings/auditlogs" class="view-logs-link">
+          View Audit Logs &rarr;
+        </router-link>
+      </div>
+    </div>
+
+    <div v-if="error" class="error-message">{{ error }}</div>
+    <div v-if="success" class="settings-success">{{ success }}</div>
+  </div>
+</template>
+
+<script setup>
+import { onMounted } from 'vue'
+import { useSystemSettings } from '../../composables/systemSettings'
+
+const {
+  settings, saving, error, success,
+  loadSettings, saveSetting,
+} = useSystemSettings()
+
+onMounted(loadSettings)
+</script>