OP-887 Aggregate all patient-linked data for GDPR portability export

[giuseppesorge]

See OP-887.

Adds the aggregation side of the GDPR Art. 20 export: a PatientExport plain aggregate and a new PatientExportManager collecting, via the existing managers, the patient record plus admissions, OPD, laboratories, therapies, operations, vaccines, examinations and bills (with items and payments). Two small manager additions back it: PatVacManager.getPatientVaccines(patientCode) and BillBrowserManager.getPatientBills(patID).

Notes for review:

• The aggregation lives in a dedicated manager rather than PatientBrowserManager: TherapyManager already constructor-injects PatientBrowserManager, so the reverse edge would create a constructor cycle.
• New permission patient.export, seeded by sql/step_a128_add_permission_patient_export.sql (P_ID_A 172, granted to admin as GP_ID 318) and mirrored in load_demo_data.sql. The step number and the two ids may need renumbering at merge: a118-a127 and the neighboring ids are reserved by other open PRs.
• Naming: the ticket says patient.export (singular); every existing patient permission is plural (patients.*). Happy to rename to patients.export if preferred — one-word change across the dependent PRs.
• Deliberately not exported (documented in the doc PR): profile photo, ward movements, visits, malnutrition, patient consensus, anamnesis, DICOM files. A follow-up ticket can add any of these if wanted.

Verified: new aggregation tests green (vaccines explicitly asserted, per the ticket note about the clinical sheet); the SQL was validated on a real MariaDB 10.6 for all three paths (fresh-install chain, upgrade-only step on an existing schema, full demo load).

Dependent PRs (same branch name for the fork cross-build): API, GUI, web UI and doc follow.

[giuseppesorge]

Dependent PRs building on this branch: informatici/openhospital-api#595, informatici/openhospital-gui#2229, informatici/openhospital-ui#778, informatici/openhospital-doc#289. Suggested merge order: this PR first (api/gui/ui CI cross-build against the fork branch until then).

[giuseppesorge]

Merged develop (31c105e) to clear the conflict in sql/step_04_all_following_steps.sql: OP-1231 appended step_a123_add_lot_management_in_pharmacy.sql at the end of the file, so this branch's own source line now comes after it. Nothing else changed, and the branch's diff against develop is the same as before the merge.