Implement rain rate processing and website view

[cchwala]

Feature overview:

• New /rain-rates page showing CML map with rain-rate-based coloring
• Interactive time selector: Current, Last 1h, -2h to -1h, -3h to -2h, -4h to -3h, Last 1d (sum), -2d to -1d (sum)
• Embedded Grafana dashboard for rain rate time series per CML
• Multi-user support with Row-Level Security isolation

Database changes:

• Migration 010: Add cml_rain_data table for processed rain rates
• Migration 011: Create cml_rain_stats aggregated view
• Migration 012: Add cml_rain_data_1h continuous aggregate with compression
• RLS policies applied to all rain data tables/views

Processor service (new):

• Modular workflow architecture with registry pattern
• pycomlink-based processing: TL->wet/dry->baseline->WAA->rain rate
• Configurable per-user settings (poll interval, data window)
• State management for tracking last processed time
• Backfill script for historical data processing in batches

Webserver enhancements:

• /api/rain-stats endpoint with offset parameter for time windows
• /api/cml-map endpoint for CML metadata
• /rain-rates route with Leaflet.js map visualization
• Resizable Grafana iframe panel

Grafana integration:

• Provisioned dashboard (UID: cml-rain-rates)
• Time series panel querying cml_rain_data_secure view
• Auto-refresh every 10s, default range 6h

Docker Compose updates:

• Added processor service with persistent state volume
• Archive generator/loader services for historical data
• MNO simulators for demo_openmrg and demo_orange_cameroun

Documentation:

• RAIN_PROCESSING_IMPLEMENTATION.md with architecture details
• Jupyter notebook for validation and debugging

[codecov]

Codecov Report

❌ Patch coverage is 13.04348% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.66%. Comparing base (6835796) to head (c631458).

Files with missing lines	Patch %	Lines
webserver/main.py	13.04%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   85.42%   85.66%   +0.24%     
==========================================
  Files          28       24       -4     
  Lines        3012     2693     -319     
==========================================
- Hits         2573     2307     -266     
+ Misses        439      386      -53     

Flag	Coverage Δ
mno_simulator	86.12% <ø> (ø)
parser	91.99% <ø> (ø)
scripts	?
webserver	68.96% <13.04%> (-4.82%)	⬇️

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