Expands crisis detection to support 7 languages:
- English (existing, consolidated)
- Spanish: 'quiero morirme', 'me quiero morir', etc.
- French: 'je veux mourir', 'je veux me tuer', etc.
- German: 'ich will sterben', 'ich will mich umbringen', etc.
- Portuguese: 'quero morrer', 'quero me matar', etc.
- Chinese: '我想死', '我不想活了', etc.
- Japanese: '死にたい', '生きたくない', etc.
Each language covers: suicidal_ideation, farewell, despair, self_harm.
Features:
- Auto-detection of language from character sets and words
- Cross-language fallback (checks English patterns for mixed text)
- Confidence scoring based on category severity and match count
- Compiled regex cache for performance
35 tests, all passing.
Closes#694
3e82c2d58f