feat: Implement application bootstrap and window management

- Added bootstrap functionality to initialize the Electron application.
- Created a new paths module to manage application paths and URLs.
- Introduced a shutdown service to handle graceful application shutdowns.
- Refactored error logging to use a dedicated logger module.
- Implemented process killing logic for NodeCG processes across platforms.
- Established navigation policies for internal and external URL handling in windows.
- Developed window service for creating and managing application windows.
- Added tests for application paths, application controller, navigation policies, process killer, and shutdown service.

src/main/logging/logger.ts

@@ -0,0 +1,34 @@
+export type LogLevel = "debug" | "info" | "warn" | "error";
+
+type LogContext = Record<string, unknown>;
+
+function write(level: LogLevel, message: string, context?: LogContext): void {
+  const payload = {
+    ts: new Date().toISOString(),
+    level,
+    source: "scoreko-electron",
+    message,
+    ...(context ? { context } : {}),
+  };
+
+  const line = JSON.stringify(payload);
+
+  if (level === "error") {
+    console.error(line);
+    return;
+  }
+
+  if (level === "warn") {
+    console.warn(line);
+    return;
+  }
+
+  console.log(line);
+}
+
+export const logger = {
+  debug: (message: string, context?: LogContext): void => write("debug", message, context),
+  info: (message: string, context?: LogContext): void => write("info", message, context),
+  warn: (message: string, context?: LogContext): void => write("warn", message, context),
+  error: (message: string, context?: LogContext): void => write("error", message, context),
+};