feat: add project specifications and agent guidelines

- Add PRD.md with complete SaaS platform requirements
- Add AGENTS.md with development standards and 12-factor principles
- Define 50/month hosting business automation scope
- Specify OVH, Cloudron, Stripe, and Dolibarr integrations

AGENTS.md

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+Perfrom all work in the output/ subdirectory. DO NOT create ANYTHING at the top level directory.
+Ensure all work is fully tested, done in docker container (prefixed with YDN-Dev-)
+Follow 12 factor principles
+Standup a full local dev stack including Dollibarr
+Use docker containers for ALL work. DO NOT pollute the host
+Write the application in the go language
+Use docker containers for the application.
+They should be able to be pushed to a private registyr and deplopyed. Create the docker-compose.yml.
+YOu will be doing development/testing/deployment end to end
+The deployment environment is a Ubuntu 24.04 host with SSH installed. YOu'll need to ssh in as root and deploy the containers, setup web frontend etc etc.

PRD.md

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+# Project Specifications
+
+Goal: Create a 100% ready to launch software as a service business called YourDreamNameHere.com (hereafter referred to as YDN)
+
+YDN Product Overview:
+    With nothing more than :
+        Credit card details
+        Desired domain name
+        E-mail address
+
+A user will get a fully soverign data hosting business/technoligy stack:
+
+    Domain registered using OVH Registrar
+    OVH VPS provisioned 
+    Cloudron installed on the VPS
+    Cloudron DNS API integration with OVH DNS provider configured
+    An invite sent to the user supplied email address to complete the on-boarding flow of the Cloudron superadmin account
+
+The cost of this will be $250.00 USD per month per domain
+
+Utilize Dollibarr for all back office functionality. 
+Utilize Stripe for pyaments/subscriptions