Redfish snapshot/export overhaul and portable release build

docs/releases/v1.2.1.md

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+# LOGPile v1.2.1
+
+Release date: 2026-02-04
+
+## Highlights
+- Redfish collection significantly expanded: dynamic Systems/Chassis/Managers discovery, PSU/GPU/PCIe inventory mapping, improved NVMe and storage parsing (including SimpleStorage and chassis drive fallbacks).
+- Added Redfish snapshot support with broad raw Redfish tree capture for future offline analysis.
+- Upload flow now accepts JSON snapshots in addition to archives, enabling offline re-open of live Redfish collections.
+- Export UX improved:
+  - Export filenames now follow `YYYY-MM-DD (SERVER MODEL) - SERVER SN`.
+  - TXT export now outputs tabular sections matching web UI views (no raw JSON dump).
+- Live API UI improvements: parser/file badges for Redfish sessions and clearer upload format messaging.
+- Redfish progress logs are more informative (snapshot stage and active top-level roots).
+- Build/distribution hardening:
+  - Cross-platform builds via `make build-all`.
+  - `CGO_ENABLED=0` for more portable single-binary distribution.
+  - Crash hold option to keep console open for debugging (`-hold-on-crash`, enabled by default on Windows).
+
+## Artifacts
+- `bin/logpile-linux-amd64`
+- `bin/logpile-linux-arm64`
+- `bin/logpile-darwin-amd64`
+- `bin/logpile-darwin-arm64`
+- `bin/logpile-windows-amd64.exe`