SL-4: structure cyan-emissive pass (owned faction colour)

Owned structures (Turret/Wall/Fabricator/Pylon) now read cyan-owned via a dedicated Mat_StructureOwned_Cyan (dark desaturated-cyan body + a subtle cyan self-illum below the bloom gate) - replacing the shared PolygonFantasyKingdom atlas + M_Turret so there's no atlas bleed. Tuned dimmer than the Core so the Engine Core stays the single luminance peak. Completes the faction palette: dark ground / cyan owned (Core bright, structures muted) / amber Ore / orange Husks. Edit-mode-instantiated + screenshot-verified. Follow-up (deferred): the research's dark-when-unpowered dynamic (emissive only on active/powered structures) needs a small presentation system reading structure state.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/_Project/Prefabs/Fabricator.prefab

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Assets/_Project/Prefabs/Pylon.prefab

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   m_EditorClassIdentifier: ProjectM.Authoring::ProjectM.Authoring.StructureAuthoring
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Assets/_Project/Prefabs/Turret.prefab

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Assets/_Project/Prefabs/Wall.prefab

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