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).

data/ddl/07_transport_types.sql

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+CREATE TABLE IF NOT EXISTS `transport_types` (
+    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
+    `name` VARCHAR(100) NOT NULL UNIQUE,
+    `descriptor` VARCHAR(100) NOT NULL UNIQUE,
+    `glyphUrl` VARCHAR(2048),
+    `createdAt` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    PRIMARY KEY (`id`)
+);
+
+INSERT IGNORE INTO `transport_types` (name, descriptor, glyphUrl) VALUES
+    ('Bus', 'bus', "https://upload.wikimedia.org/wikipedia/commons/4/46/Paris_Bus_icon.svg"),
+    ('Métro', 'metro', "https://upload.wikimedia.org/wikipedia/commons/5/5e/Metro-M.svg"),
+    ('RER', 'rer', "https://upload.wikimedia.org/wikipedia/commons/1/13/RER.svg"),
+    ('Transilien', 'transilien', "https://upload.wikimedia.org/wikipedia/fr/f/f3/Logo_Transilien_%28RATP%29.svg"),
+    ('Trains TER', 'tertrain', "https://upload.wikimedia.org/wikipedia/commons/9/98/Logo_TER.svg");

data/ddl/08_lines.sql

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+CREATE TABLE IF NOT EXISTS `lines` (
+    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
+    `code` VARCHAR(50) NOT NULL UNIQUE,
+    `name` VARCHAR(255),
+    `textColorHex` VARCHAR(7),
+    `backColorHex` VARCHAR(7),
+    `transportTypeId` INT UNSIGNED NOT NULL,
+    `createdAt` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    PRIMARY KEY (`id`),
+
+    CONSTRAINT `fk_lines_transport_type`
+        FOREIGN KEY (`transportTypeId`)
+        REFERENCES `transport_types` (`id`),
+
+    INDEX `idx_transport_type` (`transportTypeId`)
+);

data/ddl/09_stations.sql

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+CREATE TABLE IF NOT EXISTS `stations` (
+    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
+    `name` VARCHAR(255) NOT NULL,
+    `description` TEXT NULL,
+    `createdAt` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    PRIMARY KEY (id),
+    INDEX idx_stations_name (name)
+);

data/ddl/10_platforms.sql

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+CREATE TABLE IF NOT EXISTS `platforms` (
+    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
+    `stationId` INT UNSIGNED NOT NULL,
+    `name` VARCHAR(255) NULL,
+    `direction` VARCHAR(255) NULL,
+    `latitude` DECIMAL(10, 8) NOT NULL,
+    `longitude` DECIMAL(11, 8) NOT NULL,
+    `location` POINT NOT NULL,
+    `isPRM` BOOLEAN NOT NULL DEFAULT FALSE,
+    `hasElevator` BOOLEAN NOT NULL DEFAULT FALSE,
+    `createdAt` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    PRIMARY KEY (id),
+    SPATIAL INDEX idx_platforms_location (location),
+    INDEX idx_platforms_station (stationId),
+
+    CONSTRAINT fk_platforms_station FOREIGN KEY (stationId)
+        REFERENCES stations(id) ON DELETE CASCADE,
+
+    CONSTRAINT chk_platforms_latitude CHECK (latitude BETWEEN -90 AND 90),
+    CONSTRAINT chk_platforms_longitude CHECK (longitude BETWEEN -180 AND 180)
+);

data/ddl/11_platform_lines.sql

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+CREATE TABLE IF NOT EXISTS `platform_lines` (
+    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
+    `platformId` INT UNSIGNED NOT NULL,
+    `lineId` INT UNSIGNED NOT NULL,
+    `directionId` TINYINT UNSIGNED NOT NULL DEFAULT 0,
+    `orderInLine` SMALLINT UNSIGNED NOT NULL,
+
+    PRIMARY KEY (id),
+    UNIQUE KEY uq_platform_line_dir (platformId, lineId, directionId),
+    UNIQUE KEY uq_line_dir_order (lineId, directionId, orderInLine),
+    INDEX idx_pl_line (lineId),
+
+    CONSTRAINT fk_pl_platform FOREIGN KEY (platformId)
+        REFERENCES platforms(id) ON DELETE CASCADE,
+    CONSTRAINT fk_pl_line FOREIGN KEY (lineId)
+        REFERENCES `lines`(id) ON DELETE CASCADE
+);

data/ddl/12_platforms_trigger.sql

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+CREATE TRIGGER IF NOT EXISTS trg_platforms_before_insert
+    BEFORE INSERT ON `platforms`
+        FOR EACH ROW
+            BEGIN
+                SET NEW.location = POINT(NEW.longitude, NEW.latitude);
+        END;
+
+CREATE TRIGGER IF NOT EXISTS trg_platforms_before_update
+    BEFORE UPDATE ON `platforms`
+        FOR EACH ROW
+            BEGIN
+                SET NEW.location = POINT(NEW.longitude, NEW.latitude);
+        END;