fix(types): insert on an untyped schema rejects every primitive field value #52

Schema.get("myapp") and new Schema("myapp", {...}) without a type argument leave T = any, so instance().table("users") is a Table<any>. Table.insert takes DeepPartial<T> | DeepPartial<T>[] (src/staged-query/selection.ts:156), and DeepPartial<any> (src/staged-query/common.ts:13) is a mapped type with no passthrough for primitives. A string, number or boolean field value is therefore not assignable to it, and the documented untyped usage does not compile.

Reproduction (a file in docs/ checked with docs/tsconfig.json, identical on campaign/integration at d4946b0):

import { Schema } from "@antelopejs/interface-database";

const users = Schema.get("myapp")!.instance().table("users");
await users.insert({ name: "John Doe" });

tsc -p docs/tsconfig.json --noEmit reports:

error TS2322: Type 'string' is not assignable to type 'DeepPartial<any> | DeepPartial<unknown>[] | readonly DeepPartial<unknown>[] | undefined'.

The same call with a typed schema compiles: Schema.get<{ users: { _id: string; name: string } }>("myapp")!.

Expected: either an untyped schema accepts any document (DeepPartial<any> resolves to any), or the docs only show typed schemas. docs/2.operations/5.indexes.md, docs/3.results/1.index.md and docs/3.results/2.write_results.md showed the untyped form; the docs now type the schema, so this issue changes no docs.

Suggested fix: make DeepPartial<T> return T for primitives and any (for example 0 extends 1 & T ? any : ...), then add a type test for insert and update on a Table<any>.