v0.3.0 — Multilingual, filler suggestions, parallel processing

Multilingual

• Any Whisper language via --language (e.g. en) or --language auto to detect (default stays zh).
• Language-aware subtitle wrapping: English wraps on whole words (cap 42), Chinese by character (cap 20); --max-chars -1 = auto, 0 disables. Fixes mid-word English wrapping.

Filler words: suggest, don't auto-cut

• Built-in per-language filler lists (zh, en); --word optional.
• Case-insensitive matching; multi-token words supported (于是, "you know").
• Suggest-by-default — lists matches with context and cuts nothing without --indices; --json for tool/agent-driven selection.

Speed

• video-prep-edit -j N parallelizes uncached clips (~1.4×); ordering, caching, single-pass merge preserved.

41 tests pass.