CSP compliance and security updates

What's Changed

• Create dependabot.yml by @jjacque in #136
• chore(deps): bump golang.org/x/crypto from 0.45.0 to 0.46.0 by @dependabot[bot] in #137
• feat(web): comprehensive frontend security and modernization by @jjacque in #141
• chore(deps): bump github.com/hashicorp/vault from 1.21.0 to 1.21.1 by @dependabot[bot] in #138
• feat(security): comprehensive security hardening and validation by @jjacque in #143
• docs: enhance godoc comments, README documentation and add comprehensive AWS deployment guide by @jjacque in #140
• chore(deps): bump golang.org/x/crypto from 0.46.0 to 0.47.0 by @dependabot[bot] in #146
• chore(deps): bump github.com/hashicorp/vault from 1.21.1 to 1.21.2 by @dependabot[bot] in #145
• chore(deps): bump golang.org/x/crypto from 0.47.0 to 0.48.0 by @dependabot[bot] in #148
• chore(deps): bump filippo.io/edwards25519 from 1.1.0 to 1.1.1 by @dependabot[bot] in #149
• chore(deps): bump github.com/cloudflare/circl from 1.6.2-0.20250618153321-aa837fd1539d to 1.6.3 by @dependabot[bot] in #150
• chore(deps): bump golang.org/x/crypto from 0.48.0 to 0.49.0 by @dependabot[bot] in #153
• chore(deps): bump google.golang.org/grpc from 1.75.1 to 1.79.3 by @dependabot[bot] in #154
• chore(deps): bump github.com/hashicorp/vault/api from 1.22.0 to 1.23.0 by @dependabot[bot] in #155
• chore(deps): bump github.com/go-jose/go-jose/v4 from 4.1.3 to 4.1.4 by @dependabot[bot] in #157
• chore(deps): bump github.com/go-jose/go-jose/v3 from 3.0.4 to 3.0.5 by @dependabot[bot] in #156
• chore(deps): bump golang.org/x/crypto from 0.49.0 to 0.50.0 by @dependabot[bot] in #158
• chore(deps): bump go.opentelemetry.io/otel from 1.39.0 to 1.41.0 by @dependabot[bot] in #159
• chore(deps): bump golang.org/x/crypto from 0.50.0 to 0.52.0 by @dependabot[bot] in #162
• docs: add contribution standards and GitHub templates by @jjacque in #163
• chore(deps): bump github.com/labstack/echo/v4 from 4.13.4 to 4.15.2 by @dependabot[bot] in #160
• chore(deps): bump golang.org/x/crypto from 0.52.0 to 0.53.0 by @dependabot[bot] in #164
• chore(deps): bump github.com/labstack/echo/v4 from 4.15.2 to 4.15.4 by @dependabot[bot] in #166
• chore(deps): bump go.mongodb.org/mongo-driver from 1.17.4 to 1.17.7 by @dependabot[bot] in #165

Full Changelog: v0.4.3...v0.4.4