feat(telemetry): Implement structured telemetry logging and reporting

Adds comprehensive client-side telemetry capabilities for usage, errors, and performance metrics. This includes integrating OpenTelemetry standards into both the frontend (Svelte) and backend (Tauri/Rust) layers to capture events, spans, and system resource utilization.

The implementation ensures that all collected data is privacy-filtered by design, explicitly excluding sensitive information like repository paths, credentials, source code, or email addresses from being logged.

- Updates README with detailed SigNoz telemetry guide
- Adds process metrics collection (CPU/Memory) in Rust backend
- Exposes `setTelemetryEnabled` state management to the frontend

src/main.ts

@@ -2,10 +2,13 @@ import { mount } from "svelte";
 
 import App from "./App.svelte";
 import "./app.css";
+import { installGlobalErrorTelemetry } from "./lib/telemetry";
 
 const THEME_KEY = "gitlite.theme.v1";
 const target = document.getElementById("app");
 
+installGlobalErrorTelemetry();
+
 if (!target) {
   throw new Error("App target element was not found.");
 }