feat: add database initialization and mode handling logic

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/main.rs

@@ -159,4 +159,25 @@ fn main() -> Result<(), Error> {
     db_path.push("keep-1.db");
 
     debug!("MAIN: Data directory: {:?}", data_path);
-    debug!("MAIN: DB file: {:?}", db_path);
+    debug!("MAIN: DB file: {:?}", db_path);
+
+    // Ensure data directory exists
+    fs::create_dir_all(&data_path)
+        .with_context(|| format!("Unable to create data directory {:?}", data_path))?;
+
+    // Initialize database
+    let mut conn = db::init(&db_path)?;
+
+    match mode {
+        KeepModes::Save => modes::save::mode_save(&mut cmd, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::Get => modes::get::mode_get(&mut cmd, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::Diff => modes::diff::mode_diff(&mut cmd, &settings, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::List => modes::list::mode_list(&mut cmd, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::Delete => modes::delete::mode_delete(&mut cmd, &settings, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::Update => modes::update::mode_update(&mut cmd, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::Info => modes::info::mode_info(&mut cmd, &settings, ids, tags, &mut conn, data_path),
+        KeepModes::Status => modes::status::mode_status(&mut cmd, &settings, data_path, db_path),
+        KeepModes::Server => modes::server::mode_server(&mut cmd, &settings, &mut conn, data_path),
+        KeepModes::Unknown => unreachable!(),
+    }
+}