fix(scraper): fix Enercoop PDF parser to extract real prices (#63)

* fix(scraper): fix Enercoop PDF parser to correctly extract prices

The Enercoop PDF parser was using fallback values because the parsing logic
didn't match the actual PDF structure. This fix:

- Corrects subscription price extraction: PDF lists 36 HTT prices (index 0-35)
  then 36 TTC prices (index 36-71), not interleaved pairs
- Corrects kWh price extraction: PDF has 4 values (HTT old, TTC old, HTT current,
  TTC current) - we want index 3, not index 1
- Adds proper section markers for "Flexi Watt - nuit & week-end" and "2 saisons"
- Updates SEASONAL fallback prices to match current PDF (winter HP/HC values)
- Renames WEEKEND offer type to HC_NUIT_WEEKEND for consistency
- Now correctly extracts 33 offers from PDF instead of using fallback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

* chore(deps): add ruff dev dependency

---------

Co-authored-by: Clément VALENTIN <[email protected]>
Co-authored-by: Claude <[email protected]>

Author: 3 people

apps/api/pyproject.toml

@@ -71,4 +71,5 @@ dev = [
     "ruff>=0.13.3",
     "pytest>=8.4.2",
     "pytest-asyncio>=1.2.0",
+    "ruff>=0.13.3",
 ]