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/handlers/publications.go

@@ -0,0 +1,48 @@
+package handlers
+
+import (
+	"git.godopu.com/lab/landing_page/backend/internal/httpx"
+	"git.godopu.com/lab/landing_page/backend/internal/repository"
+	"github.com/gin-gonic/gin"
+)
+
+type PublicationsHandler struct {
+	repo *repository.PublicationsRepository
+}
+
+func NewPublicationsHandler(repo *repository.PublicationsRepository) *PublicationsHandler {
+	return &PublicationsHandler{repo: repo}
+}
+
+func (h *PublicationsHandler) GetPublications(c *gin.Context) {
+	category := c.Query("category")
+	if category != "" && category != "intl-journal-conf" && category != "domestic-journal-conf" {
+		httpx.BadRequest(c, "Invalid category parameter: must be 'intl-journal-conf' or 'domestic-journal-conf'")
+		return
+	}
+
+	pubs, err := h.repo.GetPublications(c.Request.Context(), category)
+	if err != nil {
+		httpx.InternalServerError(c, "Failed to retrieve publications: "+err.Error())
+		return
+	}
+	httpx.OK(c, pubs)
+}
+
+func (h *PublicationsHandler) GetHighlights(c *gin.Context) {
+	highlights, err := h.repo.GetHighlights(c.Request.Context())
+	if err != nil {
+		httpx.InternalServerError(c, "Failed to retrieve highlights: "+err.Error())
+		return
+	}
+	httpx.OK(c, highlights)
+}
+
+func (h *PublicationsHandler) GetPatents(c *gin.Context) {
+	patents, err := h.repo.GetPatents(c.Request.Context())
+	if err != nil {
+		httpx.InternalServerError(c, "Failed to retrieve patents: "+err.Error())
+		return
+	}
+	httpx.OK(c, patents)
+}