deploy: fix load-schemas paths; add 080_sfu_rooms migration

Co-authored-by: Cursor <cursoragent@cursor.com>

sim/cluster0/lab-seeds/backend/sql/migrations/080_sfu_rooms.sql

@@ -0,0 +1,38 @@
+-- SFU room management schema — MariaDB / SQLite default
+-- Created: 2026-06-28
+
+CREATE TABLE IF NOT EXISTS sfu_rooms (
+    id              BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    janus_room_id   INT             NOT NULL UNIQUE,
+    owner_id        BIGINT UNSIGNED NOT NULL,
+    name            VARCHAR(128)    NOT NULL DEFAULT '',
+    purpose         VARCHAR(32)     NOT NULL DEFAULT 'screen_cast',
+    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    closed_at       DATETIME        NULL,
+    INDEX idx_sfu_rooms_owner   (owner_id),
+    INDEX idx_sfu_rooms_closed  (closed_at)
+);
+
+CREATE TABLE IF NOT EXISTS sfu_participants (
+    id               BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    room_id          BIGINT UNSIGNED NOT NULL,
+    user_id          BIGINT UNSIGNED NOT NULL,
+    janus_handle_id  BIGINT UNSIGNED NOT NULL,
+    role             VARCHAR(16)     NOT NULL DEFAULT 'publisher',
+    joined_at        DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    left_at          DATETIME        NULL,
+    INDEX idx_sfup_room   (room_id),
+    INDEX idx_sfup_user   (user_id),
+    INDEX idx_sfup_joined (joined_at)
+);
+
+CREATE TABLE IF NOT EXISTS sfu_stats (
+    id               BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    participant_id   BIGINT UNSIGNED NOT NULL,
+    bitrate_kbps     DECIMAL(10,2)   NOT NULL DEFAULT 0,
+    packet_loss      DECIMAL(5,2)    NOT NULL DEFAULT 0,
+    sampled_at       DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    INDEX idx_sfustat_participant (participant_id),
+    INDEX idx_sfustat_time        (sampled_at)
+);