Add rule1_time_window and rule1_weekday auto modes

[partach]

Two new opt-in select entities (default: manual) that let the user delegate management of the two rule 1 registers the integration was previously leaving alone:

• rule1_time_window: auto → writes start_time=00:00, stop_time=23:59 (Felicity's 24-hour convention; firmware rejects stop=00:00 or stop=24:00).
• rule1_weekday: auto → writes effective_week=0x7F (all 7 days).

Implementation:

• coordinator._apply_rule1_auto_settings() runs every cycle. Writes are idempotent: it reads the current register value back from self.data and only writes when the value differs from the target. After a successful write, self.data is updated locally so subsequent ticks immediately see the match and skip.
• Called from the main update loop after _calculate_available_info so the warning check (_check_rule1_window_conflict) sees the corrected state in the same cycle.
• Default is "manual" so existing user-configured restrictions are preserved unless the user explicitly opts into auto.

This complements the rule1_window_warning (advisory banner) — users who don't want to manage rule 1's window themselves can flip both selects to auto and the warning will resolve automatically as the integration brings the registers into sync.