Adds EV Charger configuration and monitoring to the Deye 3-phase inverter
profile (deye_p3.yaml), with supporting read-modify-write fixes in the
select and number entity platforms.

Profile (deye_p3.yaml) — new group "EV Charger":
- EV Charger Power Mode (register 0x0103, bits[1:0]): Solar Only / Free Work
- EV Charger Inverter Connection Port (register 0x0103, bits[5:4]): Grid Port / Load Port
- EV Charger Off-Grid SOC (register 0x0103, hi-byte): minimum battery SOC
  threshold for off-grid charging, read-modify-write via mask + divide
- EV Charger Maximum Power (register 0x0104): inverter-side power cap (0–22000 W)
- EV Charger Requested Power Limit (register 0x02C5): live power limit sent
  to the EVSE by the inverter, update_interval: 5

Platform fixes:
- select.py: read-modify-write for `mask` (top-level, not display.mask) —
  reads current register, clears masked bits, ORs in new value before writing;
  triggers coordinator refresh after masked writes
- number.py: same read-modify-write pattern for number entities with `mask`
  and `divide` (used by Off-Grid SOC); fixes value_int overflow check
  (>= 0xFFFF → <= 0xFFFF)
- entity.py: trigger async_request_refresh after write when entity has a mask,
  so dependent sensors update immediately

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>