Add LOT model mapping management, UI, and first-seen tracking

migrations/0013_lot_model_mappings/down.sql

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+DROP TABLE IF EXISTS lot_model_mappings;
+DELETE FROM id_sequences WHERE entity_type = 'lot_model_mapping';

migrations/0013_lot_model_mappings/up.sql

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+CREATE TABLE IF NOT EXISTS lot_model_mappings (
+    id VARCHAR(16) PRIMARY KEY,
+    model VARCHAR(255) NOT NULL,
+    lot_id VARCHAR(16) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    CONSTRAINT fk_lot_model_mappings_lot
+        FOREIGN KEY (lot_id) REFERENCES lots(id)
+        ON DELETE CASCADE ON UPDATE CASCADE,
+    UNIQUE KEY uniq_lot_model_mappings_model (model),
+    INDEX idx_lot_model_mappings_lot (lot_id)
+);
+
+INSERT IGNORE INTO id_sequences (entity_type, next_value)
+VALUES ('lot_model_mapping', 1);