Add transport DDL, repos and transport service

Add database DDL and server-side data access/service layers for transport domain. New SQL DDL files create transport_types, lines, stations, platforms and platform_lines tables (with FKs, indexes, spatial POINT column, CHECK constraints, and triggers to populate location). New repositories implement queries and CRUD for lines, stations, platforms and platform_lines (including distance/nearest-platform and accessibility queries). A transportService aggregates repo functions and exposes high-level operations (CRUD, station/line lookups, platform-line management and nearest-platform validation).

repositories/lineRepo.js

@@ -0,0 +1,74 @@
+const { pool } = require("../modules/database")
+const { DefaultError } = require("../errors/errors")
+
+async function findAllLines() {
+    try {
+        const sql = "SELECT * FROM \`lines\`"
+        const rows = await pool.query(sql)
+        return rows
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function findLineById(lineId) {
+    try {
+        const sql = "SELECT * FROM \`lines\` WHERE id = ?"
+        const rows = await pool.query(sql, [lineId])
+        return rows[0] || null
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function findLinesByTransportType(transportTypeId) {
+    try {
+        const sql = "SELECT * FROM \`lines\` WHERE transportTypeId = ?"
+        const rows = await pool.query(sql, [transportTypeId])
+        return rows
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function createLine(code, name, textColorHex, backColorHex, transportTypeId) {
+    try {
+        const sql = "INSERT INTO \`lines\` (code, name, textColorHex, backColorHex, transportTypeId) VALUES (?, ?, ?, ?, ?)"
+        const rows = await pool.query(sql, [code, name, textColorHex, backColorHex, transportTypeId])
+        return rows.insertId
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function updateLine(lineId, updateData) {
+    try {
+        const fields = Object.keys(updateData)
+        const values = Object.values(updateData)
+        const setClause = fields.map(f => `${f} = ?`).join(", ")
+        const sql = `UPDATE \`lines\` SET ${setClause} WHERE id = ?`
+        const rows = await pool.query(sql, [...values, lineId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function deleteLine(lineId) {
+    try {
+        const sql = "DELETE FROM \`lines\` WHERE id = ?"
+        const rows = await pool.query(sql, [lineId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+module.exports = {
+    findAllLines,
+    findLineById,
+    findLinesByTransportType,
+    createLine,
+    updateLine,
+    deleteLine
+}