⚡ Bolt: Optimize pincode and MLA lookup to O(1)

[google-labs-jules]

Optimized backend/maharashtra_locator.py by changing the internal data structure for pincode and MLA data from list to dict.

• Why: To improve lookup performance from O(N) to O(1), anticipating dataset growth.
• How:
  • load_maharashtra_pincode_data now returns Dict[str, Dict].
  • load_maharashtra_mla_data now returns Dict[str, Dict].
  • Updated find_constituency_by_pincode and find_mla_by_constituency to use dictionary lookups.
• Verification: Added and ran a temporary test script verifying lookup correctness and behavior with non-existent keys. Existing logic relied on finding the first match; the dictionary conversion respects this by only inserting keys if they don't already exist.

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PR created automatically by Jules for task 11795988497950394933 started by @RohanExploit

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