feat: add airport route finder example

[roomote-v0]

Adds an airport route finder implementation using graph traversal (BFS) to determine if routes exist between airports.

Changes

• Added examples/airport-route-finder/index.ts with AirportGraph class
• Implements hasRoute(), findPath(), getReachableAirports(), and isFullyConnected() methods
• Includes sample data with 15 airports and their connections
• Added comprehensive test suite with 26 tests

Features

• Check if a route exists between any two airports
• Find the shortest path between airports using BFS
• Get all reachable airports from a starting point
• Check if the entire airport network is fully connected

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[roomote-v0]

Rooviewer   See task

Review completed. The implementation is well-structured with correct BFS algorithms, proper edge case handling, and comprehensive test coverage. No issues found.

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