Replace SQLite with JSON file storage

- Remove database.py (SQLite) from tools/storage/ and dss-mvp1/
- Add json_store.py with full JSON-based storage layer
- Update 16 files to use new json_store imports
- Storage now mirrors DSS canonical structure:
  .dss/data/
  ├── _system/    (config, cache, activity)
  ├── projects/   (per-project: tokens, components, styles)
  └── teams/      (team definitions)
- Remove Docker files (not needed)
- Update DSS_CORE.json to v1.1.0

Philosophy: "Eat our own food" - storage structure matches DSS design

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tools/dss_mcp/handler.py

@@ -22,7 +22,7 @@ from pathlib import Path
 # Note: sys.path is set up by the importing module (server.py)
 # Do NOT modify sys.path here as it causes relative import issues
 
-from storage.database import get_connection
+from storage.json_store import Projects, ActivityLog
 from .config import mcp_config, integration_config
 from .context.project_context import get_context_manager, ProjectContext
 from .tools.project_tools import PROJECT_TOOLS, ProjectTools