feat(library-desk): add configuration for HybridRAG and enhance multi-tenancy

Configuration:
- Add HybridRAG settings (reranker model, search limits)
- Change Wiki.js auth from API key to username/password
- Configure vector, graph, and web search limits

Multi-tenancy:
- Add get_neo4j_user_base_label() for entity node labeling
- Support title-cased labels following Neo4j conventions
- Maintain namespace isolation for entities vs documents

services/library-desk/src/config.py

@@ -32,7 +32,8 @@ class Settings(BaseSettings):
 
     # Wiki.js Configuration
     wikijs_url: str = Field(default="http://wiki:3000", description="Wiki.js URL")
-    wikijs_api_key: str = Field(..., description="Wiki.js API key")
+    wikijs_username: str = Field(..., description="Wiki.js username")
+    wikijs_password: str = Field(..., description="Wiki.js password")
 
     # SearXNG Configuration
     searxng_url: str = Field(default="http://searxng:8080", description="SearXNG URL")
@@ -41,6 +42,13 @@ class Settings(BaseSettings):
     ollama_url: str = Field(default="http://ollama:11434", description="Ollama URL")
     ollama_model: str = Field(default="nomic-embed-text", description="Ollama embedding model")
 
+    # HybridRAG Configuration
+    reranker_model: str = Field(default="mistral-nemo", description="Model for LLM re-ranking")
+    reranker_enabled: bool = Field(default=True, description="Enable LLM re-ranking")
+    hybrid_rag_vector_limit: int = Field(default=10, ge=1, le=50, description="Vector search limit")
+    hybrid_rag_graph_limit: int = Field(default=10, ge=1, le=50, description="Graph search limit")
+    hybrid_rag_web_limit: int = Field(default=5, ge=1, le=20, description="Web search limit")
+
     # Redis Configuration (for job tracking - separate DB from wiki)
     redis_host: str = Field(default="redis-shared", description="Redis host")
     redis_port: int = Field(default=6379, description="Redis port")

services/library-desk/src/core/multi_tenancy.py

@@ -99,6 +99,33 @@ def get_wikijs_namespace(user_id: str) -> str:
     return f"/users/{sanitized}"
 
 
+def get_neo4j_user_base_label(user_id: str) -> str:
+    """
+    Get Neo4j base label for user's nodes (entities, etc).
+
+    Pattern: User_{Sanitized}
+
+    Uses title case for Neo4j label convention.
+
+    Args:
+        user_id: User identifier
+
+    Returns:
+        Neo4j base label for user's nodes
+
+    Examples:
+        >>> get_neo4j_user_base_label("jpmschweitzer")
+        'User_Jpmschweitzer'
+        >>> get_neo4j_user_base_label("john@example.com")
+        'User_John_At_Example_Com'
+    """
+    sanitized = sanitize_user_id(user_id)
+    # Title case each segment for Neo4j label convention
+    parts = sanitized.split('_')
+    titled = '_'.join(part.capitalize() for part in parts if part)
+    return f"User_{titled}"
+
+
 def get_neo4j_user_label(user_id: str) -> str:
     """
     Get Neo4j label for user's documents.