feat(pathfinding): Add Greedy Best-First Search Algorithm

[Sanan507]

Closes #84. Added Greedy Best-First Search algorithm to Pathfinding Arena, registered in the backend factory, added complexity info. Checked test and build commands.

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PR created automatically by Jules for task 12347160299024462710 started by @Sanan507

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Project	Deployment	Actions	Updated (UTC)
algorithm-race-visualizer	Ready	Preview	Aug 3, 2026 12:21am

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