fix(logging): use stable server log paths

lib/crates/fabro-cli/src/commands/server/start.rs

@@ -172,6 +172,9 @@ fn execute_daemon(
     // Rotate logs
     let server_state = Storage::new(storage_dir).server_state();
     let log_path = server_state.log_path();
+    if let Some(parent) = log_path.parent() {
+        std::fs::create_dir_all(parent)?;
+    }
     let prev_path = log_path.with_extension("log.prev");
     let _ = std::fs::rename(&log_path, &prev_path);
 

lib/crates/fabro-cli/src/logging.rs

@@ -21,9 +21,7 @@ pub(crate) fn init_tracing(
     std::fs::create_dir_all(&log_dir)
         .with_context(|| format!("Failed to create log directory: {}", log_dir.display()))?;
 
-    let filename = chrono::Local::now()
-        .format(&format!("{log_prefix}-%Y-%m-%d.log"))
-        .to_string();
+    let filename = format!("{log_prefix}.log");
     let file_appender = rolling::never(&log_dir, &filename);
 
     let run_log_writer = run_log::init();

lib/crates/fabro-config/src/storage.rs

@@ -78,7 +78,7 @@ impl ServerState {
 
     #[must_use]
     pub fn log_path(&self) -> PathBuf {
-        self.root.join("server.log")
+        self.root.join("logs").join("server.log")
     }
 }
 
@@ -203,7 +203,7 @@ mod tests {
         );
         assert_eq!(
             storage.server_state().log_path(),
-            std::path::Path::new("/tmp/fabro-data/server.log")
+            std::path::Path::new("/tmp/fabro-data/logs/server.log")
         );
     }