Add Privacy Impact Assessment (PIA) issue template

.gitea/ISSUE_TEMPLATE/pia.md

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+## Description
+Detail the new data processing activity or feature.
+
+## Data Subject Risk Level
+- [ ] Low
+- [ ] Medium
+- [ ] High (Requires Article 35 Audit)
+
+## Data Minimization Check
+List only the specific birth date attributes required.
+
+## Mitigation Steps
+Describe pseudonymization, encryption, or access controls.
+
+## Approval Signature
+DPO / Lead Architect Verification