refactor(types): 消除非必要 as 逃逸，锁紧 strict 政策

按 Oracle 复核处置全仓 5 处类型断言：

- fields.ts: as const → satisfies Record<GeneratedFieldKey, true>
- compile.ts: as readonly string[] → ReadonlySet<string>.has()
- embed-migrations.ts: JSON.parse as Journal → Zod schema 运行时校验，JSON.parse 显式 unknown
- interceptors.ts: 唯一保留的跨包断言（ORPC→Zod）注释扩写为完整背景
- router.tsx: satisfies 非 cast，保留

biome.json 增配 noExplicitAny / noTsIgnore / noNonNullAssertion，防止后续漂移。

biome.json

@@ -24,6 +24,13 @@
       },
       "correctness": {
         "noReactPropAssignments": "error"
+      },
+      "style": {
+        "noNonNullAssertion": "error"
+      },
+      "suspicious": {
+        "noExplicitAny": "error",
+        "noTsIgnore": "error"
       }
     }
   },