Implement first four phases of medical docs roadmap

Media.JoshHeaps.Net/Database/015_medical_conditions.sql

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+-- Medical conditions linked to people
+CREATE TABLE IF NOT EXISTS app.medical_conditions (
+    id BIGSERIAL PRIMARY KEY,
+    person_id BIGINT NOT NULL REFERENCES app.medical_people(id) ON DELETE CASCADE,
+    name VARCHAR(255) NOT NULL,
+    diagnosed_date DATE NULL,
+    notes TEXT NULL,
+    is_active BOOLEAN DEFAULT true,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_medical_conditions_person_id ON app.medical_conditions(person_id);