feat(server): apply published map edits

[suixincc]

Server map persistence for published world edits

Resolves #3.

What it does

• Loads published tile overrides from the existing /maps/:mapNum/overrides API response after the server reads its static maps.
• Applies graphics and blocked-state overrides without mutating unrelated layers.
• Applies published object and NPC entity placements to the runtime map.
• Reuses the same published NPC placement overrides when spawning NPCs and creating dynamic map instances.
• Keeps malformed API entries out of the runtime map.

Testing

• pnpm test
• pnpm lint
• pnpm build

The new focused tests cover layer-aware tile application, entity replacement, and NPC placement merging.

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[suixincc]

Superseded by #374 with the full canonical map persistence scope.