v0.2.0

feat(card): expand adapter support, diagnostics export, and speed UX

• add adapter-based mapping for tplink_router and omada data sources
• add contract fixture test layer for behavior-based payload validation
• add redacted diagnostics export with UI state and truncation safeguards
• add up/down hover tooltip with utilization bar and current/max speed details
• add configurable upload/download color scales with independent max values
• add localized tooltip labels and update i18n strings
• fix up/down unit handling by treating raw values as bytes per second
• fix impossible up/down render values caused by heuristic throughput conversion
• refine speed formatting for adaptive transfer units (B/s, KB/s, MB/s, GB/s)
• update README with current speed model, tooltip semantics, and config details
• reorganize source layout and consolidate fixture documentation

Full Changelog: v0.1.1...v0.2.0