fix(logging): auto-create client row to prevent FK constraint failure

INSERT into llm_requests was failing with FOREIGN KEY constraint (code 787)
because client_id (e.g. 'client_sk-hobok') didn't exist in the clients table.
Add INSERT OR IGNORE for the client row within the same transaction.

src/logging/mod.rs

@@ -63,6 +63,15 @@ impl RequestLogger {
     async fn insert_log(pool: &SqlitePool, log: RequestLog) -> Result<(), sqlx::Error> {
         let mut tx = pool.begin().await?;
 
+        // Ensure the client row exists (FK constraint requires it)
+        sqlx::query(
+            "INSERT OR IGNORE INTO clients (client_id, name, description) VALUES (?, ?, 'Auto-created from request')",
+        )
+        .bind(&log.client_id)
+        .bind(&log.client_id)
+        .execute(&mut *tx)
+        .await?;
+
         sqlx::query(
             r#"
             INSERT INTO llm_requests