Remove DeprecatedModuleProxy and service re-export shims

Remove the deprecation proxy infrastructure that allowed old-style flat
imports (e.g. `from pipecat.services.openai import OpenAILLMService`).
Users must now import from specific submodules
(`from pipecat.services.openai.llm import OpenAILLMService`), which is
already the established pattern across all internal code and 179+ examples.

- Strip 32 proxy `__init__.py` files to empty
- Strip 3 non-proxy files with bare star imports (minimax, sambanova, sarvam)
- Strip google/gemini_live `__init__.py` re-exports
- Remove DeprecatedModuleProxy class and helpers from services/__init__.py
- Remove ruff per-file ignore for services/__init__.py
- Fix 2 examples using old-style imports

pyproject.toml

@@ -209,7 +209,6 @@ ignore = [
 "**/__init__.py" = ["D104"]
 # Skip specific rules for generated protobuf files
 "**/*_pb2.py" = ["D"]
-"src/pipecat/services/__init__.py" = ["D"]
 
 [tool.ruff.lint.pydocstyle]
 convention = "google"