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feat: allow overriding base URL of OpenAI STT and TTS (#377)

Browse source 
Mirrors the LLM treatment from #368 for the OpenAI STT and OpenAI TTS
providers. Users running OpenAI-compatible self-hosted services (vLLM,
Speaches, llama.cpp, custom proxies) can now point Dograh at them via
the OpenAI provider with `base_url`, instead of being forced onto the
Speaches provider as a workaround.

Changes:

* `registry.py` — add `base_url` field (default `https://api.openai.com/v1`)
  to `OpenAISTTConfiguration` and `OpenAITTSService`, identical in shape
  to the existing `OpenAILLMService.base_url` from #368.

* `service_factory.py` — in the OPENAI branches of `create_stt_service`
  and `create_tts_service`, lift `base_url` off the user config, run it
  through `_validate_runtime_service_url`, and forward it as a kwarg to
  `OpenAISTTService` / `OpenAITTSService` (both already accept it). Same
  pattern as the LLM branch.

* `test_user_configured_service_url_security.py` — adds four runtime
  validation tests covering private-IP rejection and localhost rejection
  in SaaS mode for both STT and TTS. Existing OSS-mode permissiveness
  is unchanged (DEPLOYMENT_MODE=oss skips the validator, as before).

No schema migration needed — Pydantic populates the default; existing
configurations without `base_url` continue to talk to api.openai.com.

`check_validity.py` requires no edits because the per-service validation
loop already iterates `("base_url", "endpoint")` via `getattr`, and the
`_check_openai_api_key` dispatcher already routes OPENAI providers
through the base_url-aware code path (introduced in #368) for STT and
TTS too.

Tests pass locally:

    pytest api/tests/test_user_configured_service_url_security.py
    23 passed in 4.80s   (19 existing + 4 new)

Co-authored-by: developer603 <developer603@users.noreply.github.com>
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8
api/services/configuration/registry.py
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@ -830,6 +830,10 @@ class OpenAITTSService(BaseTTSConfiguration):
default="alloy",
description="OpenAI TTS voice name.",
)
base_url: str = Field(
default="https://api.openai.com/v1",
description="Override only if using an OpenAI-compatible API (e.g. local TTS, proxy).",
)
DOGRAH_TTS_MODELS = ["default"]
@ -1088,6 +1092,10 @@ class OpenAISTTConfiguration(BaseSTTConfiguration):
description="OpenAI transcription model.",
json_schema_extra={"examples": OPENAI_STT_MODELS},
)
base_url: str = Field(
default="https://api.openai.com/v1",
description="Override only if using an OpenAI-compatible API (e.g. local STT, proxy).",
)
@register_stt