Implement dashboard and audit log templates, add paginated audit log support

- Added `web/templates/{dashboard,audit,base,accounts,account_detail}.html` for a consistent UI.
- Implemented new audit log endpoint (`GET /v1/audit`) with filtering and pagination via `ListAuditEventsPaged`.
- Extended `AuditQueryParams`, added `AuditEventView` for joined actor/target usernames.
- Updated configuration (`goimports` preference), linting rules, and E2E tests.
- No logic changes to existing APIs.

web/templates/account_detail.html

@@ -0,0 +1,37 @@
+{{define "account_detail"}}{{template "base" .}}{{end}}
+{{define "title"}}{{.Account.Username}} — MCIAS{{end}}
+{{define "content"}}
+<div class="page-header d-flex align-center justify-between">
+  <div>
+    <h1>{{.Account.Username}}</h1>
+    <p class="text-muted text-small">{{.Account.UUID}}</p>
+  </div>
+  <a class="btn btn-secondary" href="/accounts">← Accounts</a>
+</div>
+<div class="card">
+  <h2 style="font-size:1rem;font-weight:600;margin-bottom:1rem">Account Info</h2>
+  <dl style="display:grid;grid-template-columns:140px 1fr;gap:.5rem .75rem;font-size:.9rem">
+    <dt class="text-muted">Type</dt><dd>{{.Account.AccountType}}</dd>
+    <dt class="text-muted">Status</dt>
+    <dd id="status-cell">{{template "account_status" .}}</dd>
+    <dt class="text-muted">TOTP</dt><dd>{{if .Account.TOTPRequired}}Enabled{{else}}Disabled{{end}}</dd>
+    <dt class="text-muted">Created</dt><dd class="text-small">{{formatTime .Account.CreatedAt}}</dd>
+    <dt class="text-muted">Updated</dt><dd class="text-small">{{formatTime .Account.UpdatedAt}}</dd>
+  </dl>
+</div>
+<div class="card">
+  <h2 style="font-size:1rem;font-weight:600;margin-bottom:1rem">Roles</h2>
+  <div id="roles-editor">{{template "roles_editor" .}}</div>
+</div>
+<div class="card">
+  <div class="d-flex align-center justify-between" style="margin-bottom:1rem">
+    <h2 style="font-size:1rem;font-weight:600">Tokens</h2>
+    {{if eq (string .Account.AccountType) "system"}}
+    <button class="btn btn-sm btn-secondary"
+            hx-post="/accounts/{{.Account.UUID}}/token"
+            hx-target="#token-list" hx-swap="outerHTML">Issue Token</button>
+    {{end}}
+  </div>
+  {{template "token_list" .}}
+</div>
+{{end}}