añadido todo lo referente a paises

src/main/java/com/imprimelibros/erp/paises/Paises.java

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+package com.imprimelibros.erp.paises;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "paises")
+public class Paises {
+
+    @Id
+    @Column(name = "keyword", length = 64, nullable = false)
+    private String keyword;
+
+    @Column(name = "code", length = 2, nullable = false, unique = true)
+    private String code;
+
+    @Column(name = "code3", length = 3, nullable = false, unique = true)
+    private String code3;
+
+    @Column(name = "currency", length = 3, nullable = false)
+    private String currency;
+
+    // --- Getters & Setters ---
+
+    public String getKeyword() {
+        return keyword;
+    }
+
+    public void setKeyword(String keyword) {
+        this.keyword = keyword;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public String getCode3() {
+        return code3;
+    }
+
+    public void setCode3(String code3) {
+        this.code3 = code3;
+    }
+
+    public String getCurrency() {
+        return currency;
+    }
+
+    public void setCurrency(String currency) {
+        this.currency = currency;
+    }
+
+    // --- toString, equals & hashCode ---
+
+    @Override
+    public String toString() {
+        return "Paises{" +
+                "keyword='" + keyword + '\'' +
+                ", code='" + code + '\'' +
+                ", code3='" + code3 + '\'' +
+                ", currency='" + currency + '\'' +
+                '}';
+    }
+
+    @Override
+    public int hashCode() {
+        return keyword != null ? keyword.hashCode() : 0;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (!(obj instanceof Paises other)) return false;
+        return keyword != null && keyword.equals(other.keyword);
+    }
+}

src/main/java/com/imprimelibros/erp/paises/PaisesController.java

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+package com.imprimelibros.erp.paises;
+
+import org.springframework.context.MessageSource;
+import org.springframework.web.bind.annotation.*;
+
+import java.text.Collator;
+import java.util.*;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/api/paises")
+public class PaisesController {
+
+    private final PaisesRepository paisesRepository;
+    private final MessageSource messageSource;
+
+    public PaisesController(PaisesRepository paisesRepository, MessageSource messageSource) {
+        this.paisesRepository = paisesRepository;
+        this.messageSource = messageSource;
+    }
+
+    /**
+     * Compatible con Select2 (AJAX):
+     * - Soporta parámetros opcionales:
+     * - q / term : texto a buscar
+     * - lang : ej. "es", "en" (si se omite usa Locale actual)
+     *
+     * Respuesta:
+     * { "results": [ { "id": "espania", "text": "España" }, ... ] }
+     */
+    @GetMapping
+    public Map<String, Object> getPaises(
+            @RequestParam(value = "q", required = false) String q1,
+            @RequestParam(value = "term", required = false) String q2,
+            Locale locale) {
+
+        // Termino de búsqueda (Select2 usa 'q' o 'term' según versión/config)
+        String search = Optional.ofNullable(q1).orElse(q2);
+        if (search != null) {
+            search = search.trim();
+        }
+        final String q = (search == null || search.isEmpty())
+                ? null
+                : search.toLowerCase(locale);
+
+        List<Paises> all = paisesRepository.findAll();
+
+        // Mapear a opciones id/text con i18n y filtrar por búsqueda si llega
+        List<Map<String, String>> options = all.stream()
+                .map(cc -> {
+                    String key = cc.getKeyword();
+                    String text = messageSource.getMessage("paises." + key, null, key, locale);
+                    Map<String, String> m = new HashMap<>();
+                    m.put("id", key); // lo normal en Select2: id = valor que guardarás (keyword)
+                    m.put("text", text); // texto mostrado, i18n con fallback a keyword
+                    return m;
+                })
+                .filter(opt -> {
+                    if (q == null || q.isEmpty())
+                        return true;
+                    String text = opt.get("text").toLowerCase(locale);
+                    String id = opt.get("id").toLowerCase(locale);
+                    return text.contains(q) || id.contains(q);
+                })
+                .sorted(Comparator.comparing(m -> m.get("text"), Collator.getInstance(locale)))
+                .collect(Collectors.toList());
+
+        // Estructura Select2
+        Map<String, Object> resp = new HashMap<>();
+        resp.put("results", options);
+        return resp;
+    }
+}

src/main/java/com/imprimelibros/erp/paises/PaisesRepository.java

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+package com.imprimelibros.erp.paises;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public interface PaisesRepository extends JpaRepository<Paises, String> {
+
+    Optional<Paises> findByCode(String code);
+
+    Optional<Paises> findByCode3(String code3);
+
+    Optional<Paises> findByCurrency(String currency);
+}