feat: file blocks

Moderators block a file network-wide by its sha256, from a product's files or the console's new Blocks tab, which
first shows the products using it. Blocking removes those products (their creators are told and may appeal), puts
a `block` change in the changes feed of every catalog hosting it, and refuses uploads with it; moderators see who
tried. Unblocking lets it in again; the products it removed stay removed until restored.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/db/drizzle/0013_file_blocks.sql

@@ -0,0 +1,9 @@
+CREATE TABLE "file_block" (
+	"sha256" text PRIMARY KEY NOT NULL,
+	"reason" text NOT NULL,
+	"by_id" text,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "file_block" ADD CONSTRAINT "file_block_by_id_user_id_fk" FOREIGN KEY ("by_id") REFERENCES "public"."user"("id") ON DELETE set null ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "product_revision_files" ON "product_revision" USING gin ("files");