test(compiler): add IR validation and codegen tests for gRPC service support

[darius024]

Why?

Issue #3277 requires unit tests for gRPC service support in the Fory compiler: IR validation tests covering name, type, and streaming rules, and golden codegen tests for service schemas. The parser tests for FDL/proto/fbs service syntax already existed from closed sub-issues. This PR fills the remaining gaps.

What does this PR do?

compiler/fory_compiler/ir/validator.py

• Added _check_services() implementing three validation rules:
  1. Duplicate service names → error
  2. Duplicate method names within the same service → error
  3. RPC request/response types must be message — enum and union are rejected
• Wired _check_services() into validate() after _check_type_references()

compiler/fory_compiler/tests/test_ir_service_validation.py (new)

• Tests for all three validation rules above, across FDL, proto, and fbs frontends
• Tests that streaming RPCs (client, server, bidi) pass validation without error

compiler/fory_compiler/tests/test_service_codegen.py (new)

• Asserts service definitions do not alter message codegen output across all 7 language generators
• Documents that generate_services() returns [] as a baseline for all generators
• Verifies compile_file(..., grpc=True) succeeds and produces output for all languages using examples/service.fdl
• Asserts key signatures (class HelloRequest, String name, etc.) are present in Java and Python generated output

Related issues

• Closes [Compiler][gRPC] Test plan and cross-language smoke tests #3277
• Related to [Compiler] Add Grpc Support #3266

[Copilot]

Pull request overview

Adds IR-level validation and compiler/codegen smoke tests to cover gRPC service schema support in the Fory compiler, filling the remaining testing gaps for Issue #3277.

Changes:

• Add IR validation for duplicate service/method names and enforce RPC request/response types are messages.
• Add IR validation tests across FDL / proto / fbs, including streaming RPC cases.
• Add codegen/compile smoke tests ensuring service definitions don’t affect message codegen and --grpc compilation succeeds.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
compiler/fory_compiler/ir/validator.py	Adds _check_services() and wires it into schema validation.
compiler/fory_compiler/tests/test_ir_service_validation.py	New tests covering duplicate names, type restrictions, and streaming RPC validation.
compiler/fory_compiler/tests/test_service_codegen.py	New smoke tests to ensure services don’t change message codegen and compile_file(..., grpc=True) emits output.

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