Refactor: Organize Obsidian MCP into proper package structure

Moved obsidian_mcp.py into mcp_servers/obsidian/ to align with other
MCP server organization (SSH, Cloudflare, Loki). This improves code
discoverability and maintains consistent package structure.

Changes:
- Moved obsidian_mcp.py → mcp_servers/obsidian/obsidian_mcp.py
- Updated lazy import in llm_interface.py (line 396)
- Updated lazy import in tools.py (line 550)
- Deleted empty scripts/ directory

All imports verified with runtime tests. Zero functional changes.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

llm_interface.py

@@ -393,7 +393,7 @@ class LLMInterface:
 
             # Conditionally add Obsidian MCP server
             try:
-                from obsidian_mcp import (
+                from mcp_servers.obsidian.obsidian_mcp import (
                     is_obsidian_enabled,
                     check_obsidian_health,
                     get_obsidian_server_config,