Feat settings cascade (#3)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

server/database/migrations/postgres/010_settings_cascade.sql

@@ -0,0 +1,13 @@
+-- 010_settings_cascade.sql — v0.2.0
+-- Adds team-scoped package settings for the three-tier cascade:
+-- global (package_settings) → team (package_team_settings) → user (package_user_settings)
+
+CREATE TABLE IF NOT EXISTS package_team_settings (
+    package_id   TEXT        NOT NULL REFERENCES packages(id) ON DELETE CASCADE,
+    team_id      UUID        NOT NULL REFERENCES teams(id) ON DELETE CASCADE,
+    settings     JSONB       NOT NULL DEFAULT '{}',
+    updated_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (package_id, team_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_pkg_team_settings_team ON package_team_settings(team_id);