feat: initial ray-serve-apps PyPI package

Implements ADR-0024: Ray Repository Structure

- Ray Serve deployments for GPU-shared AI inference
- Published as PyPI package for dynamic code loading
- Deployments: LLM, embeddings, reranker, whisper, TTS
- CI/CD workflow publishes to Gitea PyPI on push to main

Extracted from kuberay-images repo per ADR-0024

ray_serve/__init__.py

@@ -0,0 +1,15 @@
+# Ray Serve deployments for GPU-shared AI inference
+# Published to Gitea PyPI as ray-serve-apps
+from ray_serve.serve_embeddings import app as embeddings_app
+from ray_serve.serve_llm import app as llm_app
+from ray_serve.serve_reranker import app as reranker_app
+from ray_serve.serve_tts import app as tts_app
+from ray_serve.serve_whisper import app as whisper_app
+
+__all__ = [
+    "embeddings_app",
+    "llm_app",
+    "reranker_app",
+    "tts_app",
+    "whisper_app",
+]