Add managed databases and services with billing-aligned upgrades.

Introduce product types for managed PostgreSQL, Redis, and RabbitMQ with a dedicated dashboard, Helm-only deploy pipeline, external access, snapshots with progress, and prorated resource or storage upgrades matching application billing rules. PVCs use an expandable StorageClass with automatic migration when legacy disks cannot resize in place.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/migrations/015_application_product_type.sql

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+-- Standalone managed services (database / redis / rabbitmq) vs full applications
+ALTER TABLE applications
+  ADD COLUMN IF NOT EXISTS product_type VARCHAR(32) NOT NULL DEFAULT 'application';
+
+CREATE INDEX IF NOT EXISTS idx_applications_user_product_type
+  ON applications (user_id, product_type);
+
+ALTER TABLE resource_credits
+  ADD COLUMN IF NOT EXISTS product_type VARCHAR(32) NOT NULL DEFAULT 'application';

backend/migrations/016_service_access_persistent.sql

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+ALTER TABLE service_access_grants
+  ADD COLUMN IF NOT EXISTS persistent BOOLEAN NOT NULL DEFAULT false;

backend/migrations/017_snapshot_progress.sql

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+-- Snapshot creation progress (0–100) for UI feedback during DB dumps
+ALTER TABLE snapshots ADD COLUMN IF NOT EXISTS progress INT NOT NULL DEFAULT 0;