feat: org-scoped prescriptions backend, wire prescriptions page

Add the prescriptions table, validation, service and CRUD routes
(/api/prescriptions, RBAC-gated; prescriber defaults to the signed-in
clinician, prescribedAt to today) and the frontend data module. The page
now loads/persists real data and computes its status KPIs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/drizzle/0003_lame_rawhide_kid.sql

@@ -0,0 +1,22 @@
+CREATE TABLE "prescriptions" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"organization_id" text NOT NULL,
+	"patient_file_number" text DEFAULT '' NOT NULL,
+	"patient_name" text NOT NULL,
+	"patient_initials" text NOT NULL,
+	"medication" text NOT NULL,
+	"dose" text DEFAULT '' NOT NULL,
+	"frequency" text NOT NULL,
+	"prescriber" text NOT NULL,
+	"prescribed_at" date DEFAULT now() NOT NULL,
+	"status" text NOT NULL,
+	"duration" text,
+	"notes" text,
+	"created_by" text,
+	"created_at" timestamp DEFAULT now() NOT NULL,
+	"updated_at" timestamp DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "prescriptions" ADD CONSTRAINT "prescriptions_organization_id_organization_id_fk" FOREIGN KEY ("organization_id") REFERENCES "public"."organization"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "prescriptions" ADD CONSTRAINT "prescriptions_created_by_user_id_fk" FOREIGN KEY ("created_by") REFERENCES "public"."user"("id") ON DELETE set null ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "prescriptions_org_idx" ON "prescriptions" USING btree ("organization_id");

backend/drizzle/meta/_journal.json

@@ -22,6 +22,13 @@
       "when": 1780849813505,
       "tag": "0002_fluffy_longshot",
       "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "7",
+      "when": 1780850147682,
+      "tag": "0003_lame_rawhide_kid",
+      "breakpoints": true
     }
   ]
 }