feat: implement cinematic universe crossover and franchise synergy engine

[Babin123456]

@SRV30

Related Issue

Closes #423

Summary

Implements a Cinematic Universe Crossover & Franchise Synergy Engine allowing studios to build interconnected movie universes, advance universe phases, trigger crossover event hype boosts, and manage shared universe fatigue.

Changes Made

• Created CinematicUniverse.js Mongoose model for universe tracking.
• Created cinematicUniverseEngine.js calculating crossover multipliers and fatigue indexes.
• Created cinematicUniverseController.js and cinematicUniverseRoutes.js API endpoints.
• Mounted /api/cinematic-universes in app.js.
• Created cinematicUniverseEngine.test.js unit test suite.

Testing

• Executed node --test tests/cinematicUniverseEngine.test.js -> 100% pass rate.

Impact

Enables high-level strategic universe planning with authentic crossover mechanics.

Checklist

• Code follows project standards
• Tested locally
• No unrelated changes included
• Responsive design verified
• Accessibility considered

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[Babin123456]

@SRV30