Refactor: Move DB operations off main thread

[sentry]

Fixes ANDROID-3. The issue was that: Main thread blocked by EmpowerPlantActivity.onCreate's slowQuery due to catastrophic regex backtracking on long strings.

• Moved database query execution to a background thread in EmpowerPlantActivity to prevent blocking the UI thread.
• Removed allowMainThreadQueries() from the AppDatabase builder, enforcing that database operations are performed off the main thread.
• Simplified a regular expression in a SQL query within StoreItemDAO.

This fix was generated by Seer in Sentry, triggered by Josh Ferge. 👁️ Run ID: 10907478

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (f12aa97) to head (1ad17f7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../vu/android/empowerplant/EmpowerPlantActivity.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #208   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        864     863    -1     
  Branches      65      65           
=====================================
+ Misses       864     863    -1     

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