Overhaul: real metrics, Git integration UI, open-source hygiene, root cleanup

Backend:
- GET /services/:id/metrics with real Docker container stats
- DELETE /git/providers/:id and GET repo branches endpoint

Frontend:
- Service detail shows real telemetry or honest empty states
- Live status distinguishes idle/polling/reconnecting
- Git providers section in Settings; repo+branch pickers in Add Service
- Real logo, compact Projects header, canvas fitView fix
- index.css deduplicated (1725 -> 1384 lines)
- Fixed smoke tests, lint errors, ToastProvider/context unification

Repo hygiene:
- Added LICENSE (MIT), CONTRIBUTING.md, SECURITY.md; rewrote README
- Untracked .env.prod and data/letsencrypt secrets; fixed .gitignore
- Removed legacy root src/internal/cmd and stale configs/docs/artifacts
- Moved guides and design references under docs/

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitignore

@@ -21,6 +21,11 @@ build/
 .env.development.local
 .env.test.local
 .env.production.local
+.env.prod
+.env.production
+.env.*.local
+!.env.example
+!.env.production.example
 
 # Logs
 logs/
@@ -69,7 +74,7 @@ jspm_packages/
 
 # Gatsby files
 .cache/
-public
+/public/
 
 # Storybook build outputs
 .out
@@ -109,4 +114,7 @@ test-results.xml
 .opencode
 .claude
 .desloppify
-bin
+bin
+# Tool session dirs
+.jj/
+.playwright-cli/