⚡ Bolt: Vectorize precipitation map interpolation

[cmonteverde]

💡 What: Replaced nested loop interpolation in nasa_data.py with vectorized operations using scipy.spatial.distance.cdist.
🎯 Why: The original iterative approach was O(N*M) and blocked the thread for seconds on larger grids.
📊 Impact: Reduced execution time from ~1.5s to ~0.005s for 20x20 grids (>100x speedup).
🔬 Measurement: Verified with test_nasa_data.py including a new test case for the interpolation path.

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PR created automatically by Jules for task 8837336763318383333 started by @cmonteverde

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