Add configuration controls, robust energy sensors, and migration support

[bbarabe]

Summary
This PR adds full System Work Mode configuration controls (numbers/switches/time/selects) gated by a new "Allow write access" option (default off). It also strengthens energy sensors, adds home consumption energy, improves setting propagation, and includes migration scaffolding for smooth upgrades from 5.0.0.

Key changes

• Config controls (Configuration entities):
  • Work Mode (sysWorkMode) and Energy Pattern (energyMode) as select entities.
  • Solar Sell, Time‑Of‑Use, Sell/Charge time enable toggles as switches.
  • Time 1‑6 as time entities.
  • Power 1‑6, Battery SOC 1‑6, Max Solar/Max Sell/Zero Export as numbers.
  • Day‑of‑week TOU switches (Mon–Sun).
• Safety gate:
  • New config option Allow write access (default false).
  • Writes blocked unless enabled.
• Master inverter handling:
  • Settings fetch/write always use the master inverter (equipMode == 1).
  • Master SN cached in memory.
• Energy sensors:
  • Grid import/export energy, battery charge/discharge energy, home consumption energy.
  • Uses HA integration sensor when available (fallback to custom).
• UX improvements:
  • Optimistic updates + delayed refresh to handle API propagation delays.
  • Options updates trigger integration reload.
  • Suggested object IDs ensure stable entity IDs (e.g., sensor.solark_grid_power).
• Migration:
  • Config flow version bumped to 2.
  • async_migrate_entry seeds allow_write_access and updates entry version.

Testing

• Manual SolArk CLI tests for live/flow/settings.
• Settings writes with Allow Write Access on/off.
• Restart HA after update.

[bbarabe]

Found an issue with battery energy - will fix before resubmitting. Also, would love to test it with single inverter (I use a master/slave)