feat(backend): Member 4 - Core API, Pathway Controller, Safety Plan C…

[bhavanaharshan]

Member 4 — Backend Logic & Integration

What this adds:

• POST /pathway/analyze → Distress triage engine (score → support tool)
• CRUD /safety-plan/ → Firestore-backed personal safety plans
• POST /notifications/checkin → FCM push notification trigger
• GET /insights/community → Anonymized BigQuery admin dashboard data
• GET /health → Health check

Environment Variables needed (ask Member 1 to set in Cloud Run):

• PROJECT_ID
• REGION
• BIGQUERY_DATASET=mindbridge_insights
• BIGQUERY_TABLE=distress_events
• VERTEX_AI_MODEL=gemini-1.5-flash-001
• FIREBASE_SERVICE_ACCOUNT_KEY (as a Secret Manager secret)

Depends on:

• Member 1: Cloud Run deployment + IAM roles
• Member 2: Vertex AI model must be enabled in the project