Committee-Account Able to Set Seperate Fee for Create Prediction Market Asset

One of the main users for Prediction Market are bookies. They create new Prediction Market Assets everyday depend on event or every minute eg. Binary Option expire in 1 minute/5 minutes/1 Hour/1Day.

The fee to create new asset now is 757.80821 BTS for both UIA/Smartcoin Asset and Prediction Market Asset. This does not make sense for bookies to spend 757.80821 BTS * 60 Minutes * 24 Hours = 1,091,243.8224‬ BTS/Day.

I suggest add a new feature so that committee members able to set separate fee for Create Prediction Market Asset.

**Impacts**
Describe which portion(s) of BitShares Core may be impacted by your request. Please tick at least one box.
- [ ] API (the application programming interface)
- [ ] Build (the build process or something prior to compiled code)
- [ ] CLI (the command line wallet)
- [ ] Deployment (the deployment process after building such as Docker, Travis, etc.)
- [ ] DEX (the Decentralized EXchange, market engine, etc.)
- [ ] P2P (the peer-to-peer network for transaction/block propagation)
- [ ] Performance (system or user efficiency, etc.)
- [] Protocol (the blockchain logic, consensus, validation, etc.)
- [ ] Security (the security of system or user data, etc.)
- [ ] UX (the User Experience)
- [ ] Other (please add below)

**Additional Context (optional)**
Add any other context about your request here.

## CORE TEAM TASK LIST
- [ ] Evaluate / Prioritize Feature Request
- [ ] Refine User Stories / Requirements
- [ ] Define Test Cases
- [ ] Design / Develop Solution
- [ ] Perform QA/Testing
- [ ] Update Documentation

No files, tests, or entry points are named. Start by locating the existing fee path for UIA/Smartcoin and prediction-market asset creation, then clarify how committee members should set the separate value. Done means an agreed protocol change with tests showing the two asset classes can use distinct fees.

Written by the indexing model from the issue text.