fix: clear 8 more services from pyright ignore list

A fourth pass over low-error-count files. Drops 8 files (57 → 49) and
full-pyright errors from 525 → 496. Default pyright stays clean.

Optional access on transport/client receivers (4 files). Same fix
shape as #4359 — a receiver typed `X | None` accessed without a
guard. For "should never happen" cases (caller's lifecycle ensures
the field is non-None when the method runs), used `assert` rather
than silent early-return so an invariant violation surfaces loudly:

- `transports/whatsapp/client.py` (5 errors): `_validate_whatsapp_webhook_request`
  was typed `bytes` / `str` but called with `bytes | None` / `str | None`.
  Widened the helper signature and pushed the explicit None-check
  inside (matching its existing empty-string check). Also handled
  `pipecat_connection.get_answer()` returning `None` — would have
  crashed at `.get("sdp")` before.
- `transports/websocket/client.py` (5 errors): four are the deprecated
  `websockets.WebSocketClientProtocol` alias (same `# pyright: ignore[reportAttributeAccessIssue]`
  as the `services/websocket_service.py` fix from earlier in this PR).
  The fifth was `async for message in self._websocket` — traced the
  call chain and confirmed `_client_task` is created only after
  `self._websocket` is assigned and cancelled before it's cleared, so
  the field is never None when `_client_task_handler` runs. Used `assert`.
- `services/openai/stt.py` (4 errors): same pattern. `_receive_messages`
  is started by `_connect()` only when `self._websocket` is set, and
  the reconnect loop in `WebsocketService._receive_task_handler`
  re-establishes it before each retry. `assert` at entry. Plus L478/L483:
  the `try`/`except ModuleNotFoundError` import-guard makes
  `websocket_connect` and `State` `<type> | None`; `__init__` already
  raises `ImportError` if either is None, so an `assert` at the
  `_connect_websocket` use site is honest. Plus an L538 `Language | str`
  cast (same shape as last batch).
- `services/deepgram/flux/base.py` (2 errors): `event = data.get("event")`
  flowed into `_handle_turn_resumed(event: str)` as `Any | None`.
  Tightened with an `isinstance(event, str)` guard before the
  `FluxEventType(event)` lookup. The other error (`average_confidence > min_confidence`
  where `min_confidence: float | None`) was a latent crash on missing
  confidence data — restored the original `not min_confidence` (which
  treats both `None` and `0.0` as "no filter") and added an explicit
  drop-on-missing-confidence-data branch.

`gemini_live` Settings/InputParams (vertex). The deprecated `InputParams`
declares `modalities: GeminiModalities | None` and `media_resolution: GeminiMediaResolution | None`,
but their downstream usage at `services/google/gemini_live/llm.py:952,959`
calls `.value` on each — `None` would crash. Rather than touching the
deprecated input model, translate `None` to the canonical defaults
(`GeminiModalities.AUDIO`, `GeminiMediaResolution.UNSPECIFIED`) at the
assignment site in `vertex/llm.py`. Also fixed an unrelated annotation
bug: `_get_credentials` was annotated `-> str` but actually returns
`service_account.Credentials` (used correctly by the caller — only
the annotation was wrong).

`moondream/vision.py` (3 errors). `frame.format` is `str | None` but
`Image.frombytes(mode, ...)` requires `str`; raise instead of crashing
on missing format. The other two errors are pyright thinking the
moondream2-custom `encode_image` and `query` methods are `Tensor`
(rather than callables) — those are provided by the model code via
`trust_remote_code=True` and aren't visible to pyright on the base
`AutoModelForCausalLM` type. Scoped `# pyright: ignore[reportCallIssue]`
on the two call sites.

`transports/base_output.py` (3 errors). Two are `self._mixer.mix(...)`
calls in `with_mixer`, a closure invoked only when `self._mixer` is
truthy at the call site — captured the mixer to a local variable
inside the closure with an `assert`, then used that. Third is the
PIL `frombytes(mode, ...)` shape — `frame.format is None` early-
return guard at the top of `resize_frame` so the main resize logic
reads cleanly.

`elevenlabs/tts.py` (4 errors). The payload-building dict at L1271
was typed `dict[str, str | dict[str, float | bool]]` — an aspirational
shape that matched only the first two assignments. Subsequent code
assigned `list[dict[...]]` (pronunciation locators) and bools, all
violating the annotation. Same pattern at L926 (the WebSocket-init
`msg`). Both widened to `dict[str, Any]`, which is the honest shape
for a JSON request payload and what similar code uses elsewhere.

Files dropped from the ignore list (57 → 49):
services/deepgram/flux/base.py, services/elevenlabs/tts.py,
services/google/gemini_live/vertex/llm.py,
services/moondream/vision.py, services/openai/stt.py,
transports/base_output.py, transports/websocket/client.py,
transports/whatsapp/client.py.

pyrightconfig.json

@@ -19,13 +19,10 @@
     "src/pipecat/services/aws/nova_sonic/llm.py",
     "src/pipecat/services/aws/sagemaker/bidi_client.py",
     "src/pipecat/services/azure/tts.py",
-    "src/pipecat/services/deepgram/flux/base.py",
     "src/pipecat/services/deepgram/flux/sagemaker/stt.py",
     "src/pipecat/services/deepgram/sagemaker/stt.py",
     "src/pipecat/services/deepgram/sagemaker/tts.py",
-    "src/pipecat/services/elevenlabs/tts.py",
     "src/pipecat/services/google/gemini_live/llm.py",
-    "src/pipecat/services/google/gemini_live/vertex/llm.py",
     "src/pipecat/services/google/llm.py",
     "src/pipecat/services/google/stt.py",
     "src/pipecat/services/google/tts.py",
@@ -35,12 +32,10 @@
     "src/pipecat/services/llm_service.py",
     "src/pipecat/services/mem0/memory.py",
     "src/pipecat/services/mistral/tts.py",
-    "src/pipecat/services/moondream/vision.py",
     "src/pipecat/services/nvidia/stt.py",
     "src/pipecat/services/nvidia/tts.py",
     "src/pipecat/services/openai/base_llm.py",
     "src/pipecat/services/openai/realtime/llm.py",
-    "src/pipecat/services/openai/stt.py",
     "src/pipecat/services/rime/tts.py",
     "src/pipecat/services/sambanova/llm.py",
     "src/pipecat/services/sarvam/stt.py",
@@ -52,16 +47,13 @@
     "src/pipecat/services/ultravox/llm.py",
     "src/pipecat/services/whisper/stt.py",
     "src/pipecat/services/xai/realtime/llm.py",
-    "src/pipecat/transports/base_output.py",
     "src/pipecat/transports/daily/transport.py",
     "src/pipecat/transports/lemonslice/transport.py",
     "src/pipecat/transports/livekit/transport.py",
     "src/pipecat/transports/smallwebrtc/connection.py",
     "src/pipecat/transports/smallwebrtc/transport.py",
     "src/pipecat/transports/tavus/transport.py",
-    "src/pipecat/transports/websocket/client.py",
-    "src/pipecat/transports/websocket/server.py",
-    "src/pipecat/transports/whatsapp/client.py"
+    "src/pipecat/transports/websocket/server.py"
   ],
   "reportMissingImports": false
 }