Fix SQLite create_if_missing so the database is auto-created on first run

Previously the binary failed with "unable to open database file" (SQLite
code 14) when no openfut.db existed yet. Using SqliteConnectOptions with
create_if_missing(true) tells SQLite to create the file if absent.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/db.rs

@@ -1,14 +1,19 @@
 use anyhow::Result;
-use sqlx::{sqlite::SqlitePoolOptions, SqlitePool};
+use sqlx::{
+    sqlite::{SqliteConnectOptions, SqlitePoolOptions},
+    SqlitePool,
+};
+use std::str::FromStr;
 use tracing::info;
 
 pub type Pool = SqlitePool;
 
 pub async fn init_pool(database_url: &str) -> Result<Pool> {
     info!("Connecting to database: {}", database_url);
+    let opts = SqliteConnectOptions::from_str(database_url)?.create_if_missing(true);
     let pool = SqlitePoolOptions::new()
         .max_connections(5)
-        .connect(database_url)
+        .connect_with(opts)
         .await?;
     sqlx::query("PRAGMA journal_mode=WAL")
         .execute(&pool)