docs: design second round of settings validation consolidation

The independent verifier found 15 more checks still living only in from_env:
six enum domains, seven conditional-required pairs and two scalar ranges.
More severe than round one because client.py has five asserts that claim
config already validated the redis_url and telemetry paths, which is false on
the from_settings path.

Also records a normalisation gap the verifier missed: _load_pg_dsn strips the
SQLAlchemy +asyncpg suffix, so a hand-built DSN reaches asyncpg unstripped.
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2026-07-30 00:46:44 -04:00
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- [2026-07-22 14:36 UTC] 重建索引: 34 篇页面
- [2026-07-30 03:44 UTC] 新增 design: GatewaySettings 跨字段不变量守卫的生效范围 (design:settings-invariant-guards)
- [2026-07-30 03:44 UTC] 重建索引: 36 篇页面
- [2026-07-30 04:44 UTC] 新增 design: GatewaySettings 装配校验补齐(第二轮) (design:settings-invariants-round-2)
- [2026-07-30 04:44 UTC] 重建索引: 38 篇页面