refactor: rename module to pipely and migrate web UI to MUI

- Rename Go module from onixbyte.com/message-converter-manifest to onixbyte.com/pipely
- Replace shadcn UI with Material UI components across all pages
- Add axios-based API client in shared/web-client with credentials management
- Organise API calls into feature modules: auth, devices, deployments, artefacts, users
- Add .env.example with VITE_API_BASE_URL pointing to pipely.onixbyte.com
- Fix deprecated FormEvent → MouseEvent in dialog submit handlers

web/.env.example

@@ -0,0 +1,13 @@
+# ─────────────────────────────────────────────────────────
+# OTA Manager Web Frontend — Environment Variables
+# ─────────────────────────────────────────────────────────
+# Copy this file to .env and adjust values for your environment:
+#   cp .env.example .env
+# ─────────────────────────────────────────────────────────
+
+# ── API Server ───────────────────────────────────────────
+
+# Base URL for the OTA Manifest Server API.
+#   Default: https://pipely.onixbyte.com/
+#   Development: http://localhost:8080
+VITE_API_BASE_URL=https://pipely.onixbyte.com/