Fix TypeScript syntax error for operationIds starting with numbers

[Copilot]

This PR fixes a TypeScript syntax error introduced in version 13.2.8 where operationIds starting with numbers would generate invalid TypeScript code when used as direct class methods.

Problem

The issue occurred when generating API classes where methods with operationIds starting with numbers (e.g., "123getUser") would use incorrect syntax:

// ❌ Invalid TypeScript - colon syntax in class method
export class Api extends HttpClient {
  "123GetUser": (params: RequestParams = {}) => // SyntaxError!
    this.request({...});
}

This caused TypeScript compilation errors:

• Expected '=' for property initializer.ts(1442)
• ',' expected.ts(1005)
• Expression expected.ts(1109)

Root Cause

The procedure-call.ejs template was using route.namespace to determine whether to use colon syntax (:) vs assignment syntax (=). However, route.namespace indicates route grouping for module organization, not the actual rendering context (class method vs object property).

Solution

Added an explicit isObjectProperty parameter passed from the api.ejs templates to correctly distinguish between:

1. Direct class methods (isObjectProperty: false) - should use assignment syntax:

   "123GetUser" = (params: RequestParams = {}) => this.request({...});

2. Object properties (isObjectProperty: true) - should use colon syntax:

   users = {
     "123GetUser": (params: RequestParams = {}) => this.request({...}),
   }

Changes

• Modified templates/default/api.ejs and templates/modular/api.ejs to pass the isObjectProperty parameter
• Updated procedure-call.ejs templates to use this parameter instead of route.namespace
• Added comprehensive tests to prevent regression
• Maintains backward compatibility with existing schemas

Testing

Added test cases covering:

• Direct class methods with operationIds starting with numbers
• Object properties with operationIds starting with numbers
• Normal identifiers to ensure no regression

All existing tests (130 total) continue to pass.

Fixes #1366.

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