Changes

Update README.md
 (commit: 2b45838)

feat(pet): Implement PetEntity and PetRepository base

Add PetEntity following JPA standards and project conventions.
Extend PetEntity from BaseEntity to inherit centralized ID management.
Implement PetRepository interface with Method Named Queries for filtering.
 (commit: 44b52bc)

feat(shelter): implement ShelterEntity and ShelterRepository base

Add ShelterEntity following the class diagram and project conventions (Entity suffix, Object wrappers).
Extend ShelterEntity from BaseEntity to reuse centralized ID management and IDENTITY generation strategy.
Implement ShelterRepository interface extending JpaRepository for automated CRUD operations.
Add Method Named Query 'findByCity' in ShelterRepository to support shelter filtering as per requirements.
Include Lombok @Data to handle boilerplate getters, setters, and toString methods.
 (commit: 6491ea9)

feat(shelter):Add methods to search by partial name and to verify email
 (commit: 26f51d7)

refactor(shelter): Convert method comments from /** */ to //
 (commit: 4a1e7d8)

feat(user): Implement User hierarchy with Observer pattern
 (commit: 3555224)

feat(user): Implement a password attribute for user login
 (commit: 5b47d52)

feat(shelter): implement VeterinarianEntity and VeterinarianRepository base
 (commit: e25ba69)

feat: add relation (aggregation) for Shelter - Veterinarians
 (commit: 94803b5)

fix: correct goodWith* variables in PetEntity
 (commit: dd99227)

feat: Implement S-V aggregation fix: import packages correctly
 (commit: 7d4ce33)

fix: delete it directory
 (commit: 08cb739)

Implement MedicalEvent entity and repository
 (commit: 3ef64c2)

Implement MedicalHistory with associations
 (commit: 74e7241)

feat: implement RepositoryBase
 (commit: 0e7481f)

feat(reports): add Strategy Pattern
 (commit: 858a7c2)

feat: implement relation to ShelterEvent
 (commit: 51e6c92)

Integración Modulo Medico al develop
 (commit: af25b63)

feat: implement Message
 (commit: db4407b)

fix: remove personal directory
 (commit: 41e479e)

fix: add missing shelter reference in PetEntity
 (commit: 89fd986)

fix: add missing vaccinationrecord reference in VaccineEntity
 (commit: 020b7fe)

fix: import data structure packages
 (commit: 7a3b6b1)

fix(pets): add relation 1:1 with MedicalHistory
 (commit: fc015f5)

feat: implement ReviewBase
 (commit: 35ac844)

feat: implement NotificationBase
 (commit: 06df10c)

feat(notification): add Strategy Pattern
 (commit: 9abb2cd)

docs: add git flow
 (commit: 37d1541)

Update README
 (commit: 1676c1e)