feat: auth/stars API, collections and publish routes, star/author migrations

indexium-backend/migrations/20260909000000_stars.sql

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+CREATE TABLE stars (
+    github_id BIGINT,
+    mod_id UUID REFERENCES mods(id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    PRIMARY KEY (github_id, mod_id)
+);

indexium-backend/migrations/20260909000001_authors.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS authors (
+    github_id BIGINT PRIMARY KEY,
+    login VARCHAR(39) NOT NULL UNIQUE,
+    avatar_url TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);