FDN-01: repository & projektgerüst

Git-Repository für bestehenden archivdms-Code initialisiert, Branch-/Commit-Konvention (feature/<ticket>-<slug>-Branches, Ticket-Prefix in Commit-Nachricht) etabliert.

internal/storage/migrations/002_reminders.sql

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+-- Dokumentation, siehe README.md. Wird zur Laufzeit idempotent von
+-- internal/storage/reminders.go initReminderSchema() erzeugt.
+
+CREATE TABLE IF NOT EXISTS reminders (
+    id          BIGSERIAL PRIMARY KEY,
+    document_id BIGINT NOT NULL REFERENCES documents(id),
+    tenant_id   BIGINT NOT NULL,
+    user_id     BIGINT NOT NULL,
+    due_date    TIMESTAMPTZ NOT NULL,
+    note        TEXT,
+    status      TEXT NOT NULL DEFAULT 'open', -- open|done|dismissed
+    notified_at TIMESTAMPTZ,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS idx_reminders_tenant_due ON reminders(tenant_id, due_date) WHERE status = 'open';
+CREATE INDEX IF NOT EXISTS idx_reminders_document ON reminders(document_id);