release: bump version to 0.58.0

Release 0.58.0 includes the Earth high-precision boundary PMTiles/MVT pipeline, standardized Earth boundary source collectors, China POV boundary configuration templates, and removal of the legacy low-precision GeoJSON fallback. It also adds Earth news target-location queueing/archive support, fixes datasource task status visibility, documents the Earth surface depth-spacing rules that prevent far-zoom z-fighting snow/black blocks, and updates bilingual operations/developer docs.

docs/technical/en/earth-frontend-context.md

@@ -122,6 +122,9 @@ Responsibilities:
 - Globe sphere, cloud layer, atmosphere
 - Real terrain mesh
 - Terrain tile fetch, decode, displacement, and shading
+- Whole-globe land/ocean and border base overlays
+
+The Earth surface is a stack of near-concentric shells, not a single mesh. The base sphere and HD texture overlay in `earth.js`, plus the land/ocean base in `country-boundaries.js`, need explicit radius separation. At far zoom, GPU depth precision drops; neighboring shells that are too close can z-fight and show black flicker blocks or snow. The current stable spacing is `landAltitudeOffset = 0.32` and `textureOverlayAltitudeOffset = 0.48`. When adding or adjusting whole-globe surface overlays, update [Earth Render Layer Order](/home/ray/dev/linkong/planet/docs/technical/en/earth-render-layer-order.md) and verify at 50% zoom.
 
 ### 7. Layer Modules