Use summation model in app

[dfulu]

Pull Request

Description

• Add the summation model to the app
• Update tests

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #71 (74cac73) into main (3339e76) will increase coverage by 0.50%. Report is 1 commits behind head on main. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   68.29%   68.80%   +0.50%     
==========================================
  Files          22       22              
  Lines        1634     1667      +33     
==========================================
+ Hits         1116     1147      +31     
- Misses        518      520       +2     

Files Changed	Coverage Δ
pvnet/app.py	93.04% <85.41%> (-1.76%)	:arrow_down:
pvnet/__init__.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[dfulu]

Yeh it runs locally, here's this mornings forecast for comparison