Improve .env discovery

[EricGustin]

Resolves TOO-201

---

Note

Implements robust .env discovery and integrates it across CLI and server, with tests and version updates.

• Add find_env_file() in arcade_mcp_server.settings to traverse parents for .env, and load with MCPSettings.from_env()
• Update CLI (configure.py, deploy.py, utils.py) to use upward .env search for secrets and provider keys; improved deploy messaging
• Enhance MCPApp reload to watch the discovered .env (including when outside cwd)
• Templates: add root .env.example for minimal toolkit; remove nested src/.../.env.example
• Tests: new test_env_discovery.py and cli/test_configure.py; refactor conftest.py to isolate environment
• Version/deps: bump arcade-mcp-server to 1.15.0 and workspace arcade-mcp to 1.8.0, update dependency constraints

^{Written by Cursor Bugbot for commit 8cb1281. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

❌ Patch coverage is 82.85714% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
libs/arcade-cli/arcade_cli/deploy.py	20.00%	4 Missing ⚠️
...ibs/arcade-mcp-server/arcade_mcp_server/mcp_app.py	71.42%	2 Missing ⚠️

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