Make license declarations consistently MIT

The source headers, LICENSE files, and license metadata had drifted
apart. Align the entire project to MIT:

- Convert every source-file header to the MIT text across all comment
  styles (Go, TS, TSX, JS, MJS, SQL, CSS, GraphQL, shell), including
  SPDX-License-Identifier tags
- Set the root and cookie-banner LICENSE files to the MIT text with a
  "MIT License" title line
- Switch the package.json license fields, Docker image label, and
  cookie-banner README to MIT
- Update docs and the genmodels header generator accordingly
- Normalize copyright lines to a single format
  (Copyright (c) <year(s)> Probo Inc <hello@probo.com>.): unify the
  hello@getprobo.com and hello@probo.inc emails to hello@probo.com and
  the comma-separated years to a hyphenated range

Genuine third-party references are intentionally left untouched: the
Lucide icon attributions (Lucide is ISC) and the trivy dependency
license allowlist.

Signed-off-by: Sacha Al Himdani <sacha@probo.com>

contrib/claude/cli.md

@@ -259,6 +259,6 @@ Use `http://` explicitly — hosts without a scheme default to HTTPS. Config is
 
 1. **Group command** — `pkg/cmd/<resource>/<resource>.go` with `NewCmd<Resource>(f)`, wiring all verb subcommands
 2. **Leaf commands** — one file per verb in `pkg/cmd/<resource>/<verb>/<verb>.go`
-3. **Each leaf file** — ISC license header, GraphQL const, unexported response struct, `NewCmd<Verb>(f)` function
+3. **Each leaf file** — MIT license header, GraphQL const, unexported response struct, `NewCmd<Verb>(f)` function
 4. **Register in root** — import and `cmd.AddCommand()` in `pkg/cmd/root/root.go`
 5. **API surface** — update GraphQL schema, MCP tools, and e2e tests