feat: integrate First8 Marketing hyper-personalization system

Enhanced Umami Analytics with First8 Marketing integration for
hyper-personalized recommendation engine.

Database Enhancements:
- PostgreSQL 17 with Apache AGE 1.6.0 (graph database)
- TimescaleDB 2.23.0 (time-series optimization)
- Extended schema for WooCommerce event tracking
- Custom tables for recommendation engine integration

Features Added:
- Real-time ETL pipeline to recommendation engine
- Extended event tracking (WordPress + WooCommerce)
- Graph database for relationship mapping
- Time-series optimization for analytics queries
- Custom migrations for hyper-personalization

Documentation:
- Updated README with integration details
- Added system architecture documentation
- Documented data flow and components
- Preserved original Umami Software credits

Integration Components:
- First8 Marketing Track plugin (event tracking)
- Recommendation Engine (ML backend)
- First8 Marketing Recommendation Engine plugin (presentation)

Status: Production-ready
Version: Based on Umami latest + First8 Marketing enhancements

docker/postgres/init-scripts/01-init-extensions.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Initialize PostgreSQL extensions for Umami
+# This script runs automatically when the container is first created
+
+set -e
+
+echo "=================================================="
+echo "Initializing PostgreSQL 17 with Extensions"
+echo "=================================================="
+
+# Wait for PostgreSQL to be ready
+until pg_isready -U "$POSTGRES_USER" -d "$POSTGRES_DB"; do
+  echo "Waiting for PostgreSQL to be ready..."
+  sleep 2
+done
+
+echo "PostgreSQL is ready. Installing extensions..."
+
+# Connect to the database and install extensions
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    -- Install TimescaleDB extension
+    CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;
+    
+    -- Install Apache AGE extension
+    CREATE EXTENSION IF NOT EXISTS age CASCADE;
+    
+    -- Load AGE into search path
+    SET search_path = ag_catalog, "\$user", public;
+    
+    -- Verify installations
+    SELECT extname, extversion FROM pg_extension WHERE extname IN ('timescaledb', 'age');
+EOSQL
+
+echo "=================================================="
+echo "Extensions installed successfully!"
+echo "- TimescaleDB: Installed"
+echo "- Apache AGE: Installed"
+echo "=================================================="
+
+echo "Database is ready for Umami migrations."
+