feat: add fluxer upstream source and self-hosting documentation

- Clone of github.com/fluxerapp/fluxer (official upstream)
- SELF_HOSTING.md: full VM rebuild procedure, architecture overview,
  service reference, step-by-step setup, troubleshooting, seattle reference
- dev/.env.example: all env vars with secrets redacted and generation instructions
- dev/livekit.yaml: LiveKit config template with placeholder keys
- fluxer-seattle/: existing seattle deployment setup scripts

fluxer/packages/schema/src/domains/premium/GiftCodeSchemas.tsx

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {UserPartialResponse} from '@fluxer/schema/src/domains/user/UserResponseSchemas';
+import {createStringType} from '@fluxer/schema/src/primitives/SchemaPrimitives';
+import {z} from 'zod';
+
+export const CreateCheckoutSessionRequest = z.object({
+	price_id: createStringType().describe('The Stripe price ID for the subscription plan'),
+});
+
+export type CreateCheckoutSessionRequest = z.infer<typeof CreateCheckoutSessionRequest>;
+
+export const GiftCodeResponse = z.object({
+	code: z.string().describe('The unique gift code string'),
+	duration_months: z.number().int().describe('Duration of the subscription gift in months'),
+	redeemed: z.boolean().describe('Whether the gift code has been redeemed'),
+	created_by: z
+		.lazy(() => UserPartialResponse)
+		.nullish()
+		.describe('The user who created the gift code'),
+});
+
+export type GiftCodeResponse = z.infer<typeof GiftCodeResponse>;
+
+export const GiftCodeMetadataResponse = z.object({
+	code: z.string().describe('The unique gift code string'),
+	duration_months: z.number().int().describe('Duration of the subscription gift in months'),
+	created_at: z.iso.datetime().describe('Timestamp when the gift code was created'),
+	created_by: z.lazy(() => UserPartialResponse).describe('The user who created the gift code'),
+	redeemed_at: z.iso.datetime().nullish().describe('Timestamp when the gift code was redeemed'),
+	redeemed_by: z
+		.lazy(() => UserPartialResponse)
+		.nullish()
+		.describe('The user who redeemed the gift code'),
+});
+
+export type GiftCodeMetadataResponse = z.infer<typeof GiftCodeMetadataResponse>;

fluxer/packages/schema/src/domains/premium/PremiumSchemas.tsx

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {createStringType} from '@fluxer/schema/src/primitives/SchemaPrimitives';
+import {z} from 'zod';
+
+export const WebhookReceivedResponse = z.object({
+	received: z.boolean().describe('Whether the webhook was successfully received'),
+});
+export type WebhookReceivedResponse = z.infer<typeof WebhookReceivedResponse>;
+
+export const UrlResponse = z.object({
+	url: z.string().describe('The URL to redirect to'),
+});
+export type UrlResponse = z.infer<typeof UrlResponse>;
+
+export const PriceIdsResponse = z.object({
+	monthly: z.string().nullish().describe('Stripe price ID for the monthly subscription'),
+	yearly: z.string().nullish().describe('Stripe price ID for the yearly subscription'),
+	gift_1_month: z.string().nullish().describe('Stripe price ID for the 1 month gift'),
+	gift_1_year: z.string().nullish().describe('Stripe price ID for the 1 year gift'),
+	currency: z.enum(['USD', 'EUR']).describe('Currency for the prices'),
+});
+export type PriceIdsResponse = z.infer<typeof PriceIdsResponse>;
+
+export const PriceIdsQueryRequest = z.object({
+	country_code: createStringType(2, 2).optional().describe('Two-letter country code for regional pricing'),
+});
+export type PriceIdsQueryRequest = z.infer<typeof PriceIdsQueryRequest>;