feat(secrets-mcp): 审计页、audit_log user_id、OAuth 登录与仪表盘 footer

- audit_log 增加 user_id；业务写审计透传 user_id
- Web /audit 与侧边栏；Dashboard 版本 footer 贴底（margin-top: auto）
- 停止 API Key 鉴权成功写入登录审计
- 文档、CI、release-check 配套更新

Made-with: Cursor

crates/secrets-core/src/service/audit_log.rs

@@ -0,0 +1,23 @@
+use anyhow::Result;
+use sqlx::PgPool;
+use uuid::Uuid;
+
+use crate::models::AuditLogEntry;
+
+pub async fn list_for_user(pool: &PgPool, user_id: Uuid, limit: i64) -> Result<Vec<AuditLogEntry>> {
+    let limit = limit.clamp(1, 200);
+
+    let rows = sqlx::query_as(
+        "SELECT id, user_id, action, namespace, kind, name, detail, actor, created_at \
+         FROM audit_log \
+         WHERE user_id = $1 OR (user_id IS NULL AND detail->>'user_id' = $1::text) \
+         ORDER BY created_at DESC, id DESC \
+         LIMIT $2",
+    )
+    .bind(user_id)
+    .bind(limit)
+    .fetch_all(pool)
+    .await?;
+
+    Ok(rows)
+}