Add FCM device registration and Gitea bug reporter

db/migrations/19_push_devices.sql

@@ -0,0 +1,14 @@
+CREATE TABLE IF NOT EXISTS push_devices (
+    id BIGSERIAL PRIMARY KEY,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
+    device_id UUID NOT NULL UNIQUE,
+    token TEXT NOT NULL UNIQUE CHECK (length(token) BETWEEN 20 AND 4096),
+    platform VARCHAR(16) NOT NULL CHECK (platform = 'android'),
+    app_version VARCHAR(32) NOT NULL DEFAULT '',
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    last_seen_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_push_devices_user ON push_devices(user_id);
+CREATE INDEX IF NOT EXISTS idx_push_devices_session ON push_devices(session_id);