v0.3.0

flickies v0.3.0 — frame-accurate `precise` flag on trim + concat

New optional `precise: bool` (default `false`) on:
  POST /v1/video/trim
  POST /v1/video/concat
(plus the matching MCP tools)

When false: keeps the existing `-c copy` stream-copy fast path.
When true: re-encodes (libx264 CRF 18 / AAC 192k) for frame-accurate
boundaries — fixes start_sec snapping to the nearest keyframe and
fixes concat of inputs with mismatched codec/timebase/SAR.

Defaults preserve prior behavior exactly. Pure additive change.
Spec info.version bumped to 0.3.0; Pydantic + Python clients
regenerated.