Address GitHub review: remove URL construction helper and use provided URLs as-is

- Remove _construct_embeddings_url() method as requested by lucasgomide
- Use URLs exactly as provided by config or environment variable
- Add comprehensive documentation about API_BASE environment variable support
- Maintain URL validation for security
- Simplify implementation to avoid assumptions about URL formats across providers

Co-Authored-By: João <joao@crewai.com>

src/crewai/utilities/embedding_configurator.py

@@ -108,17 +108,19 @@ class EmbeddingConfigurator:
         except ValueError:
             return False
 
-    @staticmethod
-    def _construct_embeddings_url(base_url):
-        """Construct the full embeddings URL from a base URL."""
-        if not base_url:
-            return "http://localhost:11434/api/embeddings"
-        
-        base_url = base_url.rstrip('/')
-        return f"{base_url}/api/embeddings" if not base_url.endswith('/api/embeddings') else base_url
-
     @staticmethod
     def _configure_ollama(config, model_name):
+        """Configure Ollama embedding function.
+        
+        Supports configuration via:
+        1. config.url - Direct URL to Ollama embeddings endpoint
+        2. config.api_base - Base URL for Ollama API 
+        3. API_BASE environment variable - Base URL from environment
+        4. Default: http://localhost:11434/api/embeddings
+        
+        Note: When using api_base or API_BASE, ensure the URL includes the full
+        embeddings endpoint path (e.g., http://localhost:11434/api/embeddings)
+        """
         from chromadb.utils.embedding_functions.ollama_embedding_function import (
             OllamaEmbeddingFunction,
         )
@@ -127,12 +129,11 @@ class EmbeddingConfigurator:
             config.get("url") 
             or config.get("api_base") 
             or os.getenv("API_BASE")
+            or "http://localhost:11434/api/embeddings"
         )
         
-        if url and not EmbeddingConfigurator._validate_url(url):
+        if not EmbeddingConfigurator._validate_url(url):
             raise ValueError(f"Invalid Ollama API URL: {url}")
-        
-        url = EmbeddingConfigurator._construct_embeddings_url(url)
 
         return OllamaEmbeddingFunction(
             url=url,