Update Database Model to reflect domain

[Swiftyos]

Added to this project as I feel this is pretty urgent.

We currently have:

• Agents (Graphs)
• Agent Templates
• Marketplace Agents
• Ability to download / install an agent from the marketplace

These concepts on longer map to what we are doing with cloud system anymore.
These are the concepts I think we need to have:

• Agents
• Active Agent - An agent that will run when triggered, for example from a web hook or scheduler
• Agent Execution - An agent actively running

These could look something like this (sudo code):

model Agent {. // Currently AgentGraph
  id        String    @default(uuid())
  version   Int       @default(1)
  ...
  author    User
  visability  Author | Group | Store   
}

model ActiveAgent {
  agent     Agent
  user      USer
  config    input_data ...
}

model AgentExecution { // Currently AgentGraphExecution
  no change from current
}

model MarketplaceAgents { // Currently Marketplace.Agents
   agent      Agent
   approvalStatus Enum
   ListingType    Enum [ FREE, AGENT, COMMISION] 
   ... other lisitng information
}

// This table lists the agents the user has added to there agents
// the availability type can be determined from the above data
model UserAvailableAgents {
   user    User
   agent   Agent
}   

Critically we are dropping the concept of templates and explicitly adds the concept of an agent