fix: Update embedder to modern model and fix Neo4j auth

- Update default OpenAI embedder from text-embedding-ada-002 to text-embedding-3-small
- Add environment variable support for Neo4j credentials (NEO4J_URI, NEO4J_USER, NEO4J_PASSWORD)
- Add environment variable support for FalkorDB credentials (FALKORDB_URI, FALKORDB_PASSWORD)
- Fixes CI/CD authentication issues where environment variables weren't being recognized

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

mcp_server/src/config/schema.py

@@ -145,7 +145,7 @@ class EmbedderConfig(BaseModel):
     """Embedder configuration."""
 
     provider: str = Field(default='openai', description='Embedder provider')
-    model: str = Field(default='text-embedding-ada-002', description='Model name')
+    model: str = Field(default='text-embedding-3-small', description='Model name')
     dimensions: int = Field(default=1536, description='Embedding dimensions')
     providers: EmbedderProvidersConfig = Field(default_factory=EmbedderProvidersConfig)
 

mcp_server/src/services/factories.py

@@ -263,10 +263,17 @@ class DatabaseDriverFactory:
 
                     neo4j_config = Neo4jProviderConfig()
 
+                # Check for environment variable overrides (for CI/CD compatibility)
+                import os
+
+                uri = os.environ.get('NEO4J_URI', neo4j_config.uri)
+                username = os.environ.get('NEO4J_USER', neo4j_config.username)
+                password = os.environ.get('NEO4J_PASSWORD', neo4j_config.password)
+
                 return {
-                    'uri': neo4j_config.uri,
-                    'user': neo4j_config.username,
-                    'password': neo4j_config.password,
+                    'uri': uri,
+                    'user': username,
+                    'password': password,
                     # Note: database and use_parallel_runtime would need to be passed
                     # to the driver after initialization if supported
                 }
@@ -286,10 +293,16 @@ class DatabaseDriverFactory:
 
                     falkor_config = FalkorDBProviderConfig()
 
+                # Check for environment variable overrides (for CI/CD compatibility)
+                import os
+
+                uri = os.environ.get('FALKORDB_URI', falkor_config.uri)
+                password = os.environ.get('FALKORDB_PASSWORD', falkor_config.password)
+
                 return {
                     'driver': 'falkordb',
-                    'uri': falkor_config.uri,
-                    'password': falkor_config.password,
+                    'uri': uri,
+                    'password': password,
                     'database': falkor_config.database,
                 }