fix(turbo): declare plugin-auth's typecheck dependency on its own build (#12043)

`@objectstack/plugin-auth`'s `typecheck` script runs a second tsc program
(`tsconfig.examples.json`) over `examples/basic-usage.ts`, which imports the
package by its own name. That resolves through `exports` to
`./dist/index.d.ts`, so the program's inputs include an artifact the package
itself produces -- and nothing declared it.

The generic `typecheck` task depends on `^build` (dependencies' build), never
the package's own, so `turbo run typecheck --filter=@objectstack/plugin-auth`
on a tree without the package's `dist/` fails with TS2307 on the example.

Declared with a package-scoped task carrying `dependsOn: ["build"]` -- the
shape the repo already uses for a task that needs its own package's build
output (`@objectstack/metadata#test`, `@objectstack/cli#test`, `test:e2e`).
Own `build` transitively pulls `^build`, so dependency ordering is unchanged.

Co-authored-by: Claude <noreply@anthropic.com>

Author: yinlianghui

turbo.json

@@ -154,6 +154,11 @@
         "$TURBO_ROOT$/packages/types/src/node-isolation.test.ts"
       ]
     },
+    "@objectstack/plugin-auth#typecheck": {
+      "dependsOn": ["build"],
+      "outputs": [],
+      "inputs": ["$TURBO_DEFAULT$", "!dist/**", "!coverage/**", "!.turbo/**"]
+    },
     "@objectstack/trigger-record-change#test": {
       "dependsOn": ["^build"],
       "inputs": [