feat: add SolidTime MCP server for time tracking integration

Implements a Model Context Protocol server that exposes SolidTime's
time tracking API as 22+ tools for use with Claude, Cursor, and other
MCP-compatible clients. Supports stdio and HTTP transport modes,
Docker deployment, and self-hosted SolidTime instances.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  solidtime-mcp:
+    build: .
+    ports:
+      - "${PORT:-3000}:3000"
+    environment:
+      - PORT=3000
+      # Optional: default SolidTime API URL for all sessions.
+      # Clients can override this via the x-solidtime-api-url header.
+      - SOLIDTIME_API_URL=${SOLIDTIME_API_URL:-https://app.solidtime.io}
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:3000/health"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s