docs(changelog): expand v0.1.0 release notes

Author: AnalyseDeCircuit

CHANGELOG.md

@@ -2,7 +2,43 @@
 
 All notable changes for this project will be documented in this file.
 
-## [v0.1.0] - 2025-12-18
-- Initial release (packaging only)
-- Docker images published to `ghcr.io/AnalyseDeCircuit/web-monitor` (linux/amd64 + linux/arm64)
-- Pre-built archives (tar.gz) for Linux
+## v0.1.0
+
+### What it is
+A lightweight, modular web-based system monitor designed to scale
+from embedded devices to small server clusters.
+
+### Features
+- CPU / Memory / Disk / Network monitoring
+- Modular feature toggles
+- Multiple run modes via Makefile:
+  - full (default)
+  - minimal
+  - server
+  - no-docker
+- Low frontend CPU usage (<15%)
+
+### Supported environments
+- Linux (bare metal / VPS)
+- Docker
+- WSL (partial)
+- macOS (limited, experimental)
+
+### Known limitations
+- No long-term historical storage
+- macOS / WSL lack some system metrics
+- No authentication hardening by default
+
+### Philosophy
+Keep it simple, observable, and cheap to run.
+
+## Who this is for
+- Small servers / VPS
+- Home lab
+- Embedded or low-power machines
+- Users who want instant visibility, not heavy dashboards
+
+## Who this is NOT for
+- Enterprise monitoring
+- Long-term metrics storage
+- Alerting / SLA systems