refactor: update import statements to use .js extensions

- Changed all import statements across the project to include the .js extension for consistency and to comply with ES module standards.
- Updated imports in various files including bootstrap.ts, shutdown.ts, config.ts, and many others.
- Ensured that all related modules and types are correctly imported with the new extension.

src/muxer.ts

@@ -1,6 +1,6 @@
 import fs from "fs";
 import path from "path";
-import { buildMuxFfmpegArgs, runFfmpeg } from "./audio/ffmpegProcess";
+import { buildMuxFfmpegArgs, runFfmpeg } from "./audio/ffmpegProcess.js";
 
 const recordingsDir = process.env.RECORDINGS_DIR ?? "./recordings";