feat(cli): support $ delimiter in resolver export names

[izumin5210]

Why

Support a naming pattern where exported resolver variable names can include namespace-like prefixes separated by $ while still deriving clean GraphQL field names.

Summary

• Add resolver export-name parsing for defineField/defineQuery/defineMutation to use the substring after the last $ as the GraphQL field name.
• Keep the original export symbol name separately for resolver imports, so generated resolver wiring remains valid.
• Add an error diagnostic when the export name ends with $ (empty suffix).
• Add golden test cases for successful delimiter parsing and empty-suffix error handling.
• Add a changeset for @gqlkit-ts/cli (minor).

Notes

• Golden snapshots were prepared in-repo; test execution could not be completed in this environment because dependency installation failed under restricted network access.

[github-actions]

Code Metrics Report

	main (f91b8db)	#163 (15032d5)	+/-
Coverage	87.4%	87.4%	+0.0%
Test Execution Time	9m0s	9m12s	+12s

Details

  |                     | main (f91b8db) | #163 (15032d5) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          87.4% |          87.4% | +0.0% |
  |   Files             |             71 |             71 |     0 |
  |   Lines             |           4671 |           4682 |   +11 |
+ |   Covered           |           4085 |           4096 |   +11 |
- | Test Execution Time |           9m0s |          9m12s |  +12s |

Code coverage of files in pull request scope (90.3% → 90.6%)

Files	Coverage	+/-	Status
packages/cli/src/gen-orchestrator/orchestrator.ts	98.2%	0.0%	modified
packages/cli/src/resolver-extractor/extractor/define-api-extractor.ts	85.1%	+0.7%	modified

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Reported by octocov