List all turf by city

User Story :
User can see list of turf by city
#### Pre-requisites :
- [ ] Turf module feature 1 should complete
- [ ] Implement Turf(find all)
- [ ] Implement Turf DAO (find all)

#### Validations :
- [ ] city ( null, empty, pattern )

#### Business Validations:
- turf city exists

``` mermaid
graph TD;A(Turf Service- city) --> B(Form Validation) -- Valid --> C(Business Validation)
B -- Invalid --> H(Validation Exception)
C -- Valid --> D(Argument Passed to Turf DAO)
D --> F(get turf list by city from DB)
C -- Invalid --> E(Validation Exception)
```

Start by checking whether the Turf module feature 1 prerequisite is complete, then trace the Turf Service city entry point and the Turf DAO find-all operation. Implement the stated city form and business validations before retrieving the matching turf list from the database. Done means valid cities return their turf list and null, empty, invalid-pattern, or nonexistent cities produce validation errors.

Written by the indexing model from the issue text.