Path Parameter Support for API Endpoints

[matKlju]

AS A Service-Module admin
I WANT support for path parameters in endpoint URLs
SO THAT I can use APIs that rely on URL-based parameters in service flows

---

Description

Add support for {param} placeholders in endpoint URLs.

• Placeholders define path parameters (e.g. /items/{id})
• Parameters are auto-detected from the URL and synced with the Params tab
• Dynamic values (${var}) are supported, but only resolved within Service Module runtime scope

No Location column is introduced.

---

Acceptance Criteria

URL Handling

• URL supports {param} placeholders
• Adding {param} auto-creates parameter in Params (mandatory)
• Parameter name must match placeholder exactly

Example:
https://api.example.com/items/{id}?lang=en&limit={limit}

• {id} treated as path parameter
• lang=en treated as static query
• {limit} treated as dynamic query
• Final URL is correctly constructed

---

URL ↔ Params Sync

• URL → Params:
  • Add/remove/rename {param} updates Params
  • Query changes in URL update Params (if mapped)
• Params → URL:
  • Rename updates {param} in URL
  • Add/remove query params updates URL
  • Deleting param removes placeholder or shows warning
  • Changing parameter values updates the URL (query string where applicable)
• URL is the source of truth for parameter structure (path + query keys)
• Params is the source of truth for parameter values
• Parameter descriptions preserved unless parameter removed

---

Runtime Behavior

• PATH parameters replaced first, QUERY applied after
• Supports:
  • static values
  • Service Module variables (${var})
• Values URL-encoded before insertion
• Final URL contains no unresolved {}

---

Validation

• Block Save/Test if:
  • PATH parameter missing value
  • Placeholder exists without parameter
• Warn if parameter not used in URL
• Clear toast errors:
  • ENG:
    • "Missing value for '{name}'"
    • "Unresolved placeholder '{name}'"
  • EST:
    • "Puudub väärtus parameetrile '{name}'"
    • "Lahendamata kohatäitja '{name}'"