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/models/home.go

@@ -0,0 +1,30 @@
+package models
+
+import "time"
+
+type ResearchProject struct {
+	ID           int       `json:"id"`
+	Slug         string    `json:"slug"`
+	Title        string    `json:"title"`
+	Abstract     string    `json:"abstract"`
+	Keywords     []string  `json:"keywords"`
+	Organization *string   `json:"organization,omitempty"`
+	StandardsOrg *string   `json:"standards_org,omitempty"`
+	Period       *string   `json:"period,omitempty"`
+	Funder       *string   `json:"funder,omitempty"`
+	CreatedAt    time.Time `json:"created_at"`
+	UpdatedAt    time.Time `json:"updated_at"`
+}
+
+type ResearchArea struct {
+	ID           int     `json:"id"`
+	NameEn       string  `json:"name_en"`
+	NameKr       *string `json:"name_kr,omitempty"`
+	DisplayOrder int     `json:"display_order"`
+}
+
+type StatsSummary struct {
+	IntlPublications    int `json:"intl_publications"`
+	StandardizationDocs int `json:"standardization_docs"`
+	Patents             int `json:"patents"`
+}