2026.1.0 Update current and forecast tariff values on the hour

What's Changed

• Update README.md to improve clarity and add new sensor details for Zonneplan integration by @ByteBrewerJB in #213
• Split into dedicated data coordinators by @fsaris in #216 #217
  • Create dedicated UpdateDataCoordinator's for each endpoint
  • Split contract related data to separate "devices"
  • Only init Gas data when there is a contract
  • Add diagnostics
  • Fix unique id of contract sensors by @fsaris in #224
• Update current and forecast tariff values on the hour #186 by @fsaris in #218
• Improve development setup by @fsaris in #220

Full Changelog: 2025.12.1...2026.1.0

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