Process manager templating & game importing (#96)

* feat: add new template options, asahi support, and refactoring

* feat: install dir scanning, validation fixes, progress fixes, download manager refactor

This kind of ballooned out of scope, but I implemented some much
needed fixes for the download manager.

First off, I cleanup the Downloadable trait, there was some
duplication of function.

Second, I refactored the "validate" into the GameDownloadAgent,
which calls a 'validate_chunk_logic' yada, same structure as
downloading.

Third, I fixed the progress and validation issues.

Fourth, I added game scanning

* feat: out of box support for Asahi Linux

* fix: clippy

* fix: don't break database

src-tauri/src/database/scan.rs

@@ -0,0 +1,52 @@
+use std::fs;
+
+use log::warn;
+
+use crate::{
+    database::{
+        db::borrow_db_mut_checked,
+        models::data::v1::{DownloadType, DownloadableMetadata},
+    },
+    games::{
+        downloads::drop_data::{v1::DropData, DROP_DATA_PATH},
+        library::set_partially_installed_db,
+    },
+};
+
+pub fn scan_install_dirs() {
+    let mut db_lock = borrow_db_mut_checked();
+    for install_dir in db_lock.applications.install_dirs.clone() {
+        let Ok(files) = fs::read_dir(install_dir) else {
+            continue;
+        };
+        for game in files.into_iter().flatten() {
+            let drop_data_file = game.path().join(DROP_DATA_PATH);
+            if !drop_data_file.exists() {
+                continue;
+            }
+            let game_id = game.file_name().into_string().unwrap();
+            let Ok(drop_data) = DropData::read(&game.path()) else {
+                warn!(
+                    ".dropdata exists for {}, but couldn't read it. is it corrupted?",
+                    game.file_name().into_string().unwrap()
+                );
+                continue;
+            };
+            if db_lock.applications.game_statuses.contains_key(&game_id) {
+                continue;
+            }
+
+            let metadata = DownloadableMetadata::new(
+                drop_data.game_id,
+                Some(drop_data.game_version),
+                DownloadType::Game,
+            );
+            set_partially_installed_db(
+                &mut db_lock,
+                &metadata,
+                drop_data.base_path.to_str().unwrap().to_string(),
+                None,
+            );
+        }
+    }
+}