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>

tools.py

@@ -547,7 +547,7 @@ def _execute_obsidian_tool(
 ) -> str:
     """Execute an Obsidian MCP tool with fallback to custom tools."""
     try:
-        from obsidian_mcp import (
+        from mcp_servers.obsidian.obsidian_mcp import (
             check_obsidian_health,
             should_fallback_to_custom,
         )
@@ -572,7 +572,7 @@ def _execute_obsidian_tool(
                 f"Please start Obsidian desktop app."
             )
     except ImportError:
-        return f"Error: obsidian_mcp module not found for tool '{tool_name}'"
+        return f"Error: mcp_servers.obsidian.obsidian_mcp module not found for tool '{tool_name}'"
 
 
 # Maximum characters of tool output to return (prevents token explosion)