fix: remove old db.rs and format db/ submodules

The db.rs → db/ split left the old file tracked, causing
"module found at both db.rs and db/mod.rs" on CI. Also
fixes import ordering flagged by cargo fmt.

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

src/db/config.rs

@@ -3,8 +3,8 @@ use sqlx::Row;
 use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 
-use super::types::*;
 use super::Db;
+use super::types::*;
 
 impl Db {
     pub async fn get_watch_dirs(&self) -> Result<Vec<WatchDir>> {

src/db/conversion.rs

@@ -1,7 +1,7 @@
 use crate::error::Result;
 
-use super::types::*;
 use super::Db;
+use super::types::*;
 
 impl Db {
     pub async fn create_conversion_job(

src/db/events.rs

@@ -48,7 +48,7 @@ pub enum SystemEvent {
 }
 
 pub struct EventChannels {
-    pub jobs: tokio::sync::broadcast::Sender<JobEvent>,     // 1000 capacity - high volume
+    pub jobs: tokio::sync::broadcast::Sender<JobEvent>, // 1000 capacity - high volume
     pub config: tokio::sync::broadcast::Sender<ConfigEvent>, // 50 capacity - rare
     pub system: tokio::sync::broadcast::Sender<SystemEvent>, // 100 capacity - medium
 }

src/db/jobs.rs

@@ -7,9 +7,9 @@ use sqlx::Row;
 use std::collections::HashMap;
 use std::path::Path;
 
+use super::Db;
 use super::timed_query;
 use super::types::*;
-use super::Db;
 
 impl Db {
     pub async fn reset_interrupted_jobs(&self) -> Result<u64> {

src/db/mod.rs

@@ -11,8 +11,8 @@ pub use types::*;
 
 use crate::error::{AlchemistError, Result};
 use sha2::{Digest, Sha256};
-use sqlx::sqlite::{SqliteConnectOptions, SqliteJournalMode};
 use sqlx::SqlitePool;
+use sqlx::sqlite::{SqliteConnectOptions, SqliteJournalMode};
 use std::time::Duration;
 use tokio::time::timeout;
 use tracing::info;

src/db/stats.rs

@@ -1,9 +1,9 @@
 use crate::error::Result;
 use sqlx::Row;
 
+use super::Db;
 use super::timed_query;
 use super::types::*;
-use super::Db;
 
 impl Db {
     pub async fn get_stats(&self) -> Result<serde_json::Value> {

src/db/system.rs

@@ -1,10 +1,10 @@
-use chrono::{DateTime, Utc};
 use crate::error::Result;
+use chrono::{DateTime, Utc};
 use sqlx::Row;
 
 use super::timed_query;
 use super::types::*;
-use super::{hash_api_token, hash_session_token, Db};
+use super::{Db, hash_api_token, hash_session_token};
 
 impl Db {
     pub async fn clear_completed_jobs(&self) -> Result<u64> {