feat: expand companion platform, device controls, and memoir workflows

Add customer and operator login, BLE provisioning, device fleet controls, call memory, memoir generation, and refreshed family and maintenance portals. Include API contracts, migrations, firmware sources, tests, assets, and deployment documentation.

migrations/000064_subject_voice_agent.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE subject_voice_agent (
+    subject_id uuid PRIMARY KEY REFERENCES subject_profile(id),
+    bot_name text NOT NULL UNIQUE,
+    bot_id text UNIQUE,
+    status text NOT NULL DEFAULT 'PENDING' CHECK (status IN ('PENDING','READY','FAILED')),
+    config jsonb NOT NULL DEFAULT '{}',
+    agent_config jsonb NOT NULL DEFAULT '{}',
+    last_error text NOT NULL DEFAULT '',
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now()
+);
+COMMENT ON TABLE subject_voice_agent IS 'One Volcano S2S bot per elder. Provider configuration stays on the server.';