feat: Add GEMINI.md and enhance pre-commit hooks (#2)

Add GEMINI.md with development guidelines.
Enhance .pre-commit-config.yaml with schema validations for Renovate, Docker Compose, and Dependabot.

Reviewed-on: #2

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v5.0.0
+  rev: v6.0.0
   hooks:
   - id: end-of-file-fixer
     exclude: (.txt$|.ipynb$|README.md$|readme.mde$)
@@ -28,13 +28,13 @@ repos:
 
 - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-  rev: v0.12.3
+  rev: v0.14.10
   hooks:
   - id: ruff
     args: [--fix, --exit-non-zero-on-fix]
 
 - repo: https://github.com/psf/black
-  rev: 25.1.0
+  rev: 25.12.0
   hooks:
   - id: black
     args: [--config=pyproject.toml]
@@ -75,16 +75,19 @@ repos:
     types_or: [css, javascript]
 
 - repo: https://github.com/python-jsonschema/check-jsonschema
-  rev: 0.27.3
+  rev: 0.36.0
   hooks:
   - id: check-jsonschema
     name: Check Gitea Workflows
     files: ^\.gitea/workflows/[^/]+$
     types: [yaml]
     args: [--builtin-schema, vendor.github-workflows]
+  - id: check-renovate
+  - id: check-compose-spec
+  - id: check-dependabot
 
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v5.0.0
+  rev: v6.0.0
   hooks:
   - id: end-of-file-fixer
     exclude: (.txt$|.ipynb$|README.md$|readme.mde$)