feat(backend,docker,docs): implement Go/Gin/SQLite REST API server, Docker containerization, and architecture specifications

- Implement standalone Go backend API server using Gin and pure-Go SQLite (modernc.org/sqlite)
- Add 11-table schema DDL migrations (000001_init.up.sql) based on DATA_TABLE.md
- Add seed data ingestion tool (cmd/seed) and static TypeScript content exporter (cmd/export-content)
- Add configuration loader (internal/config) supporting environment variables and .env files (HOST, PORT, DB_PATH, GIN_MODE, CORS_ALLOW_ORIGINS, AUTO_MIGRATE)
- Add lightweight multi-stage Dockerfile and docker-compose.yml with persistent SQLite volume
- Add comprehensive architecture specification (ARCHITECTURE.md) and REST API interface specification (API_INTERFACE.md)
- Harmonize frontend publications page to consume isHighlight flag from database-synced content

backend/internal/repository/publications.go

@@ -0,0 +1,102 @@
+package repository
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"git.godopu.com/lab/landing_page/backend/internal/models"
+)
+
+type PublicationsRepository struct {
+	db *sql.DB
+}
+
+func NewPublicationsRepository(db *sql.DB) *PublicationsRepository {
+	return &PublicationsRepository{db: db}
+}
+
+func (r *PublicationsRepository) GetPublications(ctx context.Context, category string) ([]models.Publication, error) {
+	query := `
+		SELECT id, category, title, authors, venue, volume, published_at, kci, doi, is_highlight, created_at
+		FROM publications
+	`
+	var args []any
+	if category != "" {
+		query += " WHERE category = ?"
+		args = append(args, category)
+	}
+	query += " ORDER BY published_at DESC, id ASC"
+
+	rows, err := r.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, fmt.Errorf("query publications: %w", err)
+	}
+	defer rows.Close()
+
+	var pubs []models.Publication
+	for rows.Next() {
+		var p models.Publication
+		if err := rows.Scan(
+			&p.ID, &p.Category, &p.Title, &p.Authors,
+			&p.Venue, &p.Volume, &p.PublishedAt, &p.KCI, &p.DOI, &p.IsHighlight, &p.CreatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scan publication: %w", err)
+		}
+		pubs = append(pubs, p)
+	}
+	return pubs, rows.Err()
+}
+
+func (r *PublicationsRepository) GetHighlights(ctx context.Context) ([]models.Publication, error) {
+	query := `
+		SELECT id, category, title, authors, venue, volume, published_at, kci, doi, is_highlight, created_at
+		FROM publications
+		WHERE is_highlight = 1
+		ORDER BY published_at DESC, id ASC
+	`
+	rows, err := r.db.QueryContext(ctx, query)
+	if err != nil {
+		return nil, fmt.Errorf("query highlights: %w", err)
+	}
+	defer rows.Close()
+
+	var pubs []models.Publication
+	for rows.Next() {
+		var p models.Publication
+		if err := rows.Scan(
+			&p.ID, &p.Category, &p.Title, &p.Authors,
+			&p.Venue, &p.Volume, &p.PublishedAt, &p.KCI, &p.DOI, &p.IsHighlight, &p.CreatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scan highlight: %w", err)
+		}
+		pubs = append(pubs, p)
+	}
+	return pubs, rows.Err()
+}
+
+func (r *PublicationsRepository) GetPatents(ctx context.Context) ([]models.Patent, error) {
+	query := `
+		SELECT id, title, inventors, application_no, application_at, registration_no, registration_at, country, published_at, created_at
+		FROM patents
+		ORDER BY published_at DESC, id ASC
+	`
+	rows, err := r.db.QueryContext(ctx, query)
+	if err != nil {
+		return nil, fmt.Errorf("query patents: %w", err)
+	}
+	defer rows.Close()
+
+	var patents []models.Patent
+	for rows.Next() {
+		var p models.Patent
+		if err := rows.Scan(
+			&p.ID, &p.Title, &p.Inventors, &p.ApplicationNo,
+			&p.ApplicationAt, &p.RegistrationNo, &p.RegistrationAt, &p.Country, &p.PublishedAt, &p.CreatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scan patent: %w", err)
+		}
+		patents = append(patents, p)
+	}
+	return patents, rows.Err()
+}