Add WHOOSH search service with BACKBEAT integration

Complete implementation:
- Go-based search service with PostgreSQL and Redis backend
- BACKBEAT SDK integration for beat-aware search operations
- Docker containerization with multi-stage builds
- Comprehensive API endpoints for project analysis and search
- Database migrations and schema management
- GITEA integration for repository management
- Team composition analysis and recommendations

Key features:
- Beat-synchronized search operations with timing coordination
- Phase-based operation tracking (started → querying → ranking → completed)
- Docker Swarm deployment configuration
- Health checks and monitoring
- Secure configuration with environment variables

Architecture:
- Microservice design with clean API boundaries
- Background processing for long-running analysis
- Modular internal structure with proper separation of concerns
- Integration with CHORUS ecosystem via BACKBEAT timing

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

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

internal/database/postgres.go

@@ -0,0 +1,62 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/chorus-services/whoosh/internal/config"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/rs/zerolog/log"
+)
+
+type DB struct {
+	Pool *pgxpool.Pool
+}
+
+func NewPostgresDB(cfg config.DatabaseConfig) (*DB, error) {
+	config, err := pgxpool.ParseConfig(cfg.URL)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse database config: %w", err)
+	}
+
+	config.MaxConns = int32(cfg.MaxOpenConns)
+	config.MinConns = int32(cfg.MaxIdleConns)
+	config.MaxConnLifetime = time.Hour
+	config.MaxConnIdleTime = time.Minute * 30
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	pool, err := pgxpool.NewWithConfig(ctx, config)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create connection pool: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("failed to ping database: %w", err)
+	}
+
+	log.Info().
+		Str("host", cfg.Host).
+		Int("port", cfg.Port).
+		Str("database", cfg.Database).
+		Msg("Connected to PostgreSQL")
+
+	return &DB{Pool: pool}, nil
+}
+
+func (db *DB) Close() {
+	if db.Pool != nil {
+		db.Pool.Close()
+		log.Info().Msg("Database connection closed")
+	}
+}
+
+func (db *DB) Health(ctx context.Context) error {
+	if err := db.Pool.Ping(ctx); err != nil {
+		return fmt.Errorf("database health check failed: %w", err)
+	}
+	return nil
+}