feat(simulation): location-to-culture resolution system (#679)

CultureResolver with Arc<Mutex<Connection>> over systems.db (SQLITE_OPEN_READ_ONLY).
3-pass lookup: system_id → body_id (COALESCE parent fallback) → station_id.
CultureResolverResource registered in main.rs with graceful warn-on-missing.
BookmarkRegistry.build_catalog() uses resolver for allowed_locations_cultures.
8 unit tests including concurrent safety. SQLite fixture at
server/src/knowledge/fixtures/culture_test.db.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/src/knowledge/mod.rs

@@ -8,12 +8,14 @@ use bevy_app::prelude::*;
 use bevy_ecs::prelude::*;
 
 pub mod content_registry;
+pub mod culture;
 pub mod events;
 pub mod graph;
 pub mod registry;
 pub mod types;
 
 pub use content_registry::ContentEntityRegistry;
+pub use culture::{CultureError, CultureResolver, CultureResolverResource, CultureTag, resolve_culture};
 pub use events::{
     ContradictionDetectedEvent, ContradictionDetectedQueue, InteractionType, KnowledgeEvent,
     KnowledgeEventQueue, KnowledgeEventType, ProcessedEntityGrant, ProcessedFactGrant,