Add camp spot goals from BSP entities (AAS entity caching + BotGetNextCampSpotGoal)

[themuffinator]

Motivation

• Expose map-defined camp spots so the goal system can iterate info_camp entities as selectable goals.
• Use parsed BSP entity key/value data produced by the AAS parser instead of re-parsing the BSP on demand.
• Seed level item/camp spot tables during map load so AI has the same level data lifecycle as the original implementation.
• Wire the camp spot query into the botlib exports so the engine and other subsystems can request camp spot goals.

Description

• Cache parsed BSP entity epairs in the AAS layer and add iteration/lookup helpers: AAS_NextBSPEntity, AAS_ValueForBSPEpairKey, AAS_VectorForBSPEpairKey, AAS_FloatForBSPEpairKey, and AAS_IntForBSPEpairKey (plus parsing/cleanup helpers and header declarations).
• Implement BotInitLevelItems to scan parsed BSP entities for info_camp and populate a linked list of camp spots, and implement BotGetNextCampSpotGoal to return ordered camp goals.
• Add AI-level wrappers AI_GoalBotlib_InitLevelItems and AI_GoalBotlib_GetNextCampSpotGoal, call AI_GoalBotlib_InitLevelItems() after a successful BotLoadMap, and export BotGetNextCampSpotGoal via bot_export_t.
• Update relevant headers (aas_map.h, bot_goal.h, ai_goal.h, q2bridge/botlib.h) and ensure memory cleanup for cached BSP entities on world clear.

Testing

• No automated tests were run for this change.

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Codex Task