fix(space): EVA asteroid mining obeys drill tiers, hardness and inventory space

[marceld23]

Summary

During an EVA spacewalk, any asteroid block could be mined with a single bare-hand click — no drill, no hardness, titanium included — while the same block on a planet requires a tier-2 drill and several timed hits. With a full inventory the ore was silently lost (the cell was cleared before the drops were banked).

Closes #685.

Changes

Server (GameServerSpaceStructure.cs)

• Asteroid mining now runs the planet rules: ToolCanMine (drill kind + MinToolTier) and per-cell hardness accumulation (progress += tool.MiningPower until BlockDefinition.Hardness), tracked in a new _structureMiningProgress map keyed by structure id + cell (same same-block guard as the world path).
• Drops are capacity-checked with MaterialPool.CanFit before the cell clears (mirrors Mined drops are silently destroyed when inventory and cargo are full #600): a full inventory refuses the break with the standard @inventory_full reject; banked progress survives, so the block falls on the next hit once there is room.
• Own-ship and station editing stays instant by design — construction UX, not resource gathering. Stale progress is dropped when an asteroid despawns.

Protocol (Messages.cs, NetCodec.cs)

• New StructureMiningProgress message (structure-local cell + fraction), registered as tag 188.

Client (NetworkClient.cs, SpaceView.cs)

• EVA mining is hold-to-repeat at the on-foot drill pace (0.28 s) instead of one intent per click.
• The aim marker warms from cyan to orange with the server-reported progress, so multi-hit ore visibly works toward breaking.

Balance result

Block	Bare hand	Drill t1 (power 1)	Drill t2 (power 2)
ice (0.8)	1 hit	1 hit	1 hit
iron_ore (4.0)	rejected	4 hits	2 hits
titanium_ore (7.2)	rejected	rejected	4 hits

Soft materials keep the light one-hit feel by their own hardness; titanium keeps its tier-2 progression gate.

Tests

• EvaMine_TakesOreFromAVoxelAsteroid updated (tier-2 drill, 4 hits).
• New: EvaAsteroidMine_NeedsSeveralHits_AndTheRightDrill (bare hand + t1 rejected, t2 holds for 3 hits, falls on the 4th) and EvaAsteroidMine_RefusedWhenTheDropsWouldNotFit (full personal + cargo → refused losslessly; freeing a slot finishes the break).
• Ship one-click editing stays locked in by the existing EvaStructureEdit_* tests.
• Local: full Release build 0 warnings, 1363 + 147 tests green, Unity Windows client build OK.

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