fix: keep Drizzle out of every published declaration (ADR 0053)

@ekklesia/contracts still emitted a type-only import of
drizzle-orm/node-postgres for the legacy ModuleDatabase facade, so a
standalone module type-checked only because skipLibCheck hid it.

- ModuleDatabase, LegacyModuleRuntimeServices and
  AnyModuleRuntimeServices move to core/src/modules/database.ts, beside
  the facade Core builds; the facade itself is unchanged.
- contracts' runtime, route, and services generics no longer name an
  ORM: the database type is a plain parameter defaulting to the ABI v1
  executor, and the legacy definition's database is opaque until Core
  specializes it. Core and apps/api name the legacy types from Core.
- contracts drops its drizzle-orm optional peer and devDependency;
  Drizzle stays public only through @ekklesia/module-database/drizzle.
- The facade's type-level test moves from contracts to Core.
- Regression proof: the standalone fixture type-checks with
  skipLibCheck: false against the packed tarballs, with no drizzle-orm
  installed (the smoke asserts both). Against the previous contracts
  tarball the same check fails with TS2307 on drizzle-orm/node-postgres.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

core/tests/module-runtime.test.ts

@@ -1,13 +1,12 @@
 import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
+import type { ModuleConfiguration, ModuleDatabaseExecutor } from "@ekklesia/contracts";
 import type {
   AnyModuleRuntimeServices,
-  ModuleConfiguration,
+  LegacyModuleRuntimeServices,
   ModuleDatabase,
-  ModuleDatabaseExecutor,
-  ModuleRuntimeServices,
-} from "@ekklesia/contracts";
+} from "../src/modules/database.js";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { discoverModules } from "../src/modules/discovery.js";
 import {
@@ -151,7 +150,7 @@ function fakeModuleDatabase(): ModuleDatabase {
 }
 
 function fakeModuleRuntimeServices(): ModuleRuntimeServicesLookup {
-  const services = new Map<string, ModuleRuntimeServices>();
+  const services = new Map<string, LegacyModuleRuntimeServices>();
   const database = fakeModuleDatabase();
   return new Proxy(services, {
     get(target, property, receiver) {