Refactor: Move Room database operations off the main thread

[seer-by-sentry]

Fixes ANDROID-3. The issue was that: Room database configured with allowMainThreadQueries causes synchronous DELETE and INSERT operations to block the UI thread during activity load.

• Removed .allowMainThreadQueries() from AppDatabase configuration.
• Introduced ExecutorService in EmpowerPlantActivity and MainFragment.
• Wrapped all database operations in dbQuery() and insertMultipleStoreItems() to execute asynchronously on a background thread.

This fix was generated by Seer in Sentry, triggered by prithvirajkumar.rajakumar@sentry.io. 👁️ Run ID: 8031264

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (1feb90a) to head (889c34f).

Files with missing lines	Patch %	Lines
.../vu/android/empowerplant/EmpowerPlantActivity.java	0.00%	20 Missing ⚠️
.../example/vu/android/empowerplant/MainFragment.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #199   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        885     869   -16     
  Branches      65      65           
=====================================
+ Misses       885     869   -16     

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