feat: Complete Phase 5 dashboard implementation

Implement full 5-tab Toronto Neighbourhood Dashboard with real data
connectivity:

Dashboard Structure:
- Overview tab with livability scores and rankings
- Housing tab with affordability metrics
- Safety tab with crime statistics
- Demographics tab with population/income data
- Amenities tab with parks, schools, transit

Figure Factories (portfolio_app/figures/):
- bar_charts.py: ranking, stacked, horizontal bars
- scatter.py: scatter plots, bubble charts
- radar.py: spider/radar charts
- demographics.py: donut, age pyramid, income distribution

Service Layer (portfolio_app/toronto/services/):
- neighbourhood_service.py: queries dbt marts for all tab data
- geometry_service.py: generates GeoJSON from PostGIS
- Graceful error handling when database unavailable

Callbacks (portfolio_app/pages/toronto/callbacks/):
- map_callbacks.py: choropleth updates, map click handling
- chart_callbacks.py: supporting chart updates
- selection_callbacks.py: dropdown handlers, KPI updates

Data Pipeline (scripts/data/):
- load_toronto_data.py: orchestration script with CLI flags

Lessons Learned:
- Graceful error handling in service layers
- Modular callback structure for multi-tab dashboards
- Figure factory pattern for reusable charts

Closes: #64, #65, #66, #67, #68, #69, #70

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: setup docker-up docker-down db-init run test dbt-run dbt-test lint format ci deploy clean help
+.PHONY: setup docker-up docker-down db-init load-data run test dbt-run dbt-test lint format ci deploy clean help
 
 # Default target
 .DEFAULT_GOAL := help
@@ -71,6 +71,14 @@ db-reset: ## Drop and recreate database (DESTRUCTIVE)
 	@sleep 3
 	$(MAKE) db-init
 
+load-data: ## Load Toronto data from APIs and run dbt
+	@echo "$(GREEN)Loading Toronto neighbourhood data...$(NC)"
+	$(PYTHON) scripts/data/load_toronto_data.py
+
+load-data-only: ## Load Toronto data without running dbt
+	@echo "$(GREEN)Loading Toronto data (skip dbt)...$(NC)"
+	$(PYTHON) scripts/data/load_toronto_data.py --skip-dbt
+
 # =============================================================================
 # Application
 # =============================================================================