Add archive data auto-loading on database initialization

[cchwala]

Closes #8

Summary of changes in this PR:

• Implement parse_netcdf_archive.py to load historical CML data from NetCDF files into PostgreSQL using efficient COPY FROM operations with configurable time range limiting
• Add generate_archive.py script to create compressed archive data files (metadata + time-series) for demo setup and database initialization
• Enhance Grafana dashboard with Interval (Auto/1min/5min/15min/1h/6h/1d) and Aggregation (Mean/Raw/Min/Max/Median/StdDev) dropdown controls (required because we now show more data with the longer archive)
• Refactor dashboard queries to UNION ALL pattern separating raw and aggregated data paths, with safe interval casting for auto-scaling support (related to point above)
• Add unit tests for archive scripts covering database truncation, file creation, and error handling (0.5s runtime)

[codecov]

Codecov Report

❌ Patch coverage is 89.70100% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.72%. Comparing base (841b78a) to head (784536e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
parser/parse_netcdf_archive.py	84.10%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   64.64%   68.72%   +4.08%     
==========================================
  Files          19       22       +3     
  Lines        1547     1848     +301     
==========================================
+ Hits         1000     1270     +270     
- Misses        547      578      +31     

Flag	Coverage Δ
mno_simulator	87.87% <100.00%> (+2.05%)	⬆️
parser	80.56% <86.75%> (+2.20%)	⬆️
webserver	29.63% <ø> (ø)

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