Initial commit: MaskanX backend

Independent FastAPI backend for the MaskanX agentic growth platform.

Includes the agent runtime, MCP client integrations (Meta Ads, LinkedIn,
HubSpot, Tavily, Exa, xAI, Citedy, image generation), PostgreSQL storage
for chats and cron jobs, provider and secret management, and the CLI.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.env.production.example

@@ -0,0 +1,12 @@
+MASKANX_ENV=production
+MASKANX_STORAGE_BACKEND=postgres
+MASKANX_PORT=8088
+MASKANX_CORS_ORIGINS=https://app.example.com
+DATABASE_URL=postgresql://maskanx:replace-me@postgres.example.internal:5432/campaign?sslmode=require
+LOG_LEVEL=INFO
+
+# Store provider credentials in the deployment secret manager.
+CITEDY_API_KEY=
+TAVILY_API_KEY=
+EXA_API_KEY=
+XAI_API_KEY=