zenfun 5c01497ce0 fix(api): handle zero-baseline edge cases in trend calculation ...

Introduce `CalculateTrendFloatWithBaseline` to correctly handle scenarios where previous period metrics (Error Rate, Latency) are zero or missing. This prevents arithmetic errors and distinguishes between "new" data and actual increases ("up") when starting from zero.

Also updates the admin panel dashboard documentation to reflect current project status.

2026-01-02 23:17:55 +08:00

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