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/seed/data/research_areas.json

@@ -0,0 +1,72 @@
+[
+  {
+    "name_en": "Quick UDP Internet Connection (QUIC)",
+    "name_kr": null,
+    "display_order": 1
+  },
+  {
+    "name_en": "QUIC-based Mobility and Multi-Streaming Support",
+    "name_kr": null,
+    "display_order": 2
+  },
+  {
+    "name_en": "Services and Protocols for Internet-of-Things (IoT)",
+    "name_kr": null,
+    "display_order": 3
+  },
+  {
+    "name_en": "Constrained Application Protocol (CoAP)",
+    "name_kr": null,
+    "display_order": 4
+  },
+  {
+    "name_en": "In-Vehicle Infotainment (IVI)",
+    "name_kr": null,
+    "display_order": 5
+  },
+  {
+    "name_en": "Optical Wireless or Visible Light Communications (OWC/VLC)",
+    "name_kr": null,
+    "display_order": 6
+  },
+  {
+    "name_en": "Lighting Control Networks (PLASA E1.45) for LED-based VLC",
+    "name_kr": null,
+    "display_order": 7
+  },
+  {
+    "name_en": "Mobility Management: Distributed Mobility Control",
+    "name_kr": null,
+    "display_order": 8
+  },
+  {
+    "name_en": "Multicast Routing Protocols and Reliable Multicasting",
+    "name_kr": null,
+    "display_order": 9
+  },
+  {
+    "name_en": "mobile SCTP (mSCTP): Soft Handover in Transport Layer",
+    "name_kr": null,
+    "display_order": 10
+  },
+  {
+    "name_en": "Stream Control Transmission Protocol (SCTP)",
+    "name_kr": null,
+    "display_order": 11
+  },
+  {
+    "name_en": "Telecommunication Optimization: Network Planning and Management",
+    "name_kr": null,
+    "display_order": 12
+  },
+  {
+    "name_en": "TAC/TAL Configuration for Paging and Location Management",
+    "name_kr": null,
+    "display_order": 13
+  },
+  {
+    "name_en": "Tabu Search and Genetic Algorithm",
+    "name_kr": null,
+    "display_order": 14
+  }
+]