feat: add studio roadmap and streaming cleanup

roadmap.md

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+# VibePod Roadmap
+
+## Studio Vision
+
+VibePod Studio will turn generated audio from a one-shot download into a reusable editing workspace. The core idea is to persist each generation as a project artifact with the source script, voice, generation settings, audio file, waveform peaks, and edit history, then expose those artifacts in a timeline editor.
+
+## Phase 1: Generation Artifacts
+
+- Store generated audio as server-side jobs instead of browser-only object URLs.
+- Save job metadata: script, speaker, cfg scale, inference steps, duration, sample rate, created date, and generation status.
+- Generate waveform peak data for fast timeline rendering.
+- Add a library view for previous generations.
+
+## Phase 2: Basic Studio Editor
+
+- Add a Studio route with waveform timeline playback.
+- Support trim start/end, split, delete range, silence insertion, fade in/out, and clip gain.
+- Keep edits non-destructive by storing an edit decision list instead of rewriting the original audio immediately.
+- Export edited audio as WAV first, then add compressed formats later.
+
+## Phase 3: Regeneration Workflow
+
+- Link script text ranges to generated audio ranges.
+- Allow users to select a clip and regenerate just that segment.
+- Support voice/settings changes per regenerated segment.
+- Add replace, insert, and compare-take workflows.
+
+## Phase 4: Multi-Speaker Projects
+
+- Support script blocks with per-speaker assignment.
+- Render speakers into separate timeline lanes.
+- Add voice presets, reusable show templates, and episode-level settings.
+- Support intro/outro/music beds once the audio engine can mix multiple lanes.
+
+## Phase 5: Production Export
+
+- Add loudness normalization, silence cleanup, and final mastering presets.
+- Export MP3, WAV, and podcast-ready metadata.
+- Add project save/load, autosave, and recoverable render jobs.
+- Prepare the audio pipeline for queueing longer renders outside the request lifecycle.
+
+## Foundation Work Needed First
+
+- Persist generated outputs with stable IDs.
+- Move waveform and WAV assembly into reusable modules.
+- Add cancellation-aware generation jobs.
+- Add a backend audio processing layer for edits and exports.
+- Keep the current generate screen as the fast path while Studio grows beside it.