Add 11 missing Torah citations to mitzvahs.md

Completed all remaining citation gaps found in systematic review:
- #70: Castrated man marriage restriction (Deut 23:2)
- #119: Yom Kippur fasting requirement (Lev 23:29)
- #151: Nazir hair prohibition (Num 6:5)
- #167: Sorceress prohibition (Ex 22:17)
- #193: Breaking vows prohibition (Num 30:3)
- #234: Thanksgiving offering overnight (Lev 22:30)
- #252: Altar fire requirement (Lev 6:6)
- #277: Fourth-year produce (Lev 19:24)
- #300: Priest impurity service (Lev 22:2)
- #339: False measures prohibition (Deut 25:13)
- #354: Castration prohibition (Lev 22:24)

All citations include Sefaria links and relevant Torah quotes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: idvorkin