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/lima/probo.yaml

@@ -1,5 +1,5 @@
-# Copyright (c) 2025, 2026 Probo Inc.
-# SPDX-License-Identifier: ISC
+# Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
+# SPDX-License-Identifier: MIT
 
 images:
   - location: "https://cloud-images.ubuntu.com/releases/24.04/release/ubuntu-24.04-server-cloudimg-amd64.img"

contrib/lima/provision.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
-# Copyright (c) 2025, 2026 Probo Inc.
-# SPDX-License-Identifier: ISC
+# Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
+# SPDX-License-Identifier: MIT
 
 set -euo pipefail
 

contrib/lima/sandbox.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
-# Copyright (c) 2025, 2026 Probo Inc.
-# SPDX-License-Identifier: ISC
+# Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
+# SPDX-License-Identifier: MIT
 
 set -euo pipefail