feat(query): positional where() args and attribute-typed autocompletion

[3m1n3nc3]

• where()/orWhere() now accept positional forms in addition to objects, callbacks, and expressions: where(column, value), where(column, operator, value), and the unary where(column, 'is-null' | 'is-not-null'). '<>' and '==' are normalized to '!=' and '='. The column is typed to the model's attributes (autocompletes and rejects unknown columns).
• Add ModelWhereInput as the primary object overload so the where-object keys autocomplete from the model's declared attributes instead of resolving to a loose, any-typed input. The Prisma-delegate QuerySchemaWhere overload is retained for compatibility.

Tests: positional behavior (equality/operator/unary/aliases, AND+OR mixing) and
type-level assertions for column typing. Docs: filtering section.

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/QueryBuilder.ts	97.29%	1 Missing ⚠️

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