Add FunASR/SenseVoice API backend

[LauraGPT]

Summary

• add a first-class FunASR API model backed by a separately running FunASR/SenseVoice OpenAI-compatible server
• support file/folder imports, live recording, and the funasrapi CLI model type
• add configurable base URL and model settings, with environment overrides for protected or remote endpoints
• keep FunASR credentials isolated from the saved OpenAI key and enforce the backend's transcription-only contract
• document server setup and usage across preferences, file import, live recording, and CLI guides

Boundary fixes

• allow live recording to start without a local model path for FUNASR_API, matching the existing OpenAI API behavior
• disable unsupported word-level parsing for FunASR responses so a text-only or empty-segment response cannot raise TypeError or discard the transcript
• omit prompt and timestamp_granularities fields that the FunASR endpoint does not support

Current-main refresh

• merge current main@d1b6844d851cb475e6532299d18181d10681ff9b without rewriting the feature history
• resolve the only conflict in docs/docs/preferences.md, retaining both the upstream GPU-memory preference and the complete FunASR API settings documentation
• incorporate seven upstream commits covering Windows playback, CI caches, speaker identification, packaging, and build workflows without leaking those upstream-only files into the PR diff
• current SSH-signed, DCO-compliant head: ba87e21b460b75c5cc77e6a2abc06167ce718b30

Verification

• focused API, CLI, model-loader, file/recording, preferences, and UI suite: 352 passed
• exact final candidate broad repository suite: 1146 passed, 10 skipped (run twice after preparing generated translations; final run completed in 561.27s)
• the previously failing localized-preferences test passes after the repository-standard make translation_mo generated all 15 ignored locale artifacts
• frozen uv lock check with uv 0.11.29, Python 3.12.3, Transformers 5.14.1, and Torch 2.8.0+cu129
• all 22 changed Python files compile; Ruff reports zero diagnostics on PR-added lines, and all three newly added Python files pass the complete lint and formatter checks
• workflow YAML and project TOML parsing, submodule cleanliness, conflict-marker scan, whitespace checks, and git diff --check
• final PR scope remains exactly 27 files (+712/-58)

GitHub reports the PR MERGEABLE on the exact head, with no unresolved review threads. The exact-head CI and Snapcraft runs are action_required with zero jobs, so a maintainer must approve the fork workflows before GitHub can execute them. The pre-refresh head is retained at LauraGPT/buzz:codex/backup-buzz-1554-2b77a036-20260811 for rollback.

Closes #1140

[LauraGPT]

Follow-up for head c7951ec: review found and fixed two contributor-side boundaries before maintainer review:

• live recording now allows the empty local model path required by FUNASR_API;
• FunASR file transcription disables unsupported word-level parsing and preserves text-only/empty-segment responses instead of raising TypeError or returning no transcript.

Current local verification is green: 13 focused FunASR tests, 96 recording-widget tests, and the broad repository suite (1037 passed, 4 skipped), plus Ruff on the changed production modules and git diff --check.

The new CI and Snapcraft runs are both action_required with zero jobs, so they need maintainer approval before GitHub can execute them. No rush given your summer schedule; approval and review whenever convenient would be appreciated.

[raivisdejus]

Summer is busy time, but sure, I will review this.

[LauraGPT]

Refreshed this PR onto current main@d1b6844d851c with an SSH-signed, DCO-compliant merge commit. The only conflict was in docs/docs/preferences.md; the resolution keeps both the upstream GPU-memory preference and the full FunASR API settings documentation.

Validation on exact head ba87e21b460b:

• focused FunASR/API/CLI/model/UI suite: 352 passed
• broad repository suite: 1146 passed, 10 skipped (final candidate run: 561.27s)
• localized-preferences regression: passed after generating all 15 locale artifacts with the repository's make translation_mo target
• uv lock --check, changed-file Python compilation, workflow YAML and TOML parsing
• zero Ruff diagnostics on PR-added lines; all three new Python files pass complete Ruff lint and formatter checks
• clean submodules, conflict-marker and whitespace scans, and git diff --check
• exact PR scope: 27 files, +712/-58

GitHub now reports MERGEABLE against current main, with no unresolved review threads. The exact-head CI and Snapcraft runs are action_required with zero jobs, so they require maintainer approval before GitHub can execute them. The old head remains available on codex/backup-buzz-1554-2b77a036-20260811 for rollback.