feat: add Fizzy application

[arunfung]

What changed

• Add Fizzy application metadata, official logo, and Chinese/English deployment guidance.
• Package the official ghcr.io/basecamp/fizzy:latest image for amd64 and arm64.
• Persist Fizzy databases, queues, cache, and attachments under the 1Panel application data directory.
• Add required SMTP delivery settings, optional authenticated/anonymous SMTP support, and selectable direct-HTTP or HTTPS-reverse-proxy modes.
• Preserve Fizzy's upstream database preparation entrypoint while normalizing empty optional SMTP credentials.

Why

Fizzy is a lightweight Kanban project management application from 37signals. This package makes its official container installable and manageable through 1Panel while preserving data and supporting 1Panel-managed domains and certificates.

Validation

• Parsed all YAML files and validated the complete 11-language metadata/form label set.
• Validated both HTTP and HTTPS Compose configurations and both shell scripts.
• Verified the official image supports linux/amd64 and linux/arm64.
• Tested the official image locally for startup, health, restart persistence, empty/non-empty SMTP credential handling, HTTP-to-HTTPS redirect behavior, proxy HTTPS behavior, and HSTS.
• Tested the package on a real 1Panel host: local-app installation, real email-code login, board/card use, attachment persistence after restart, domain/HTTPS access, stop/start, and uninstall all succeeded.

Licensing note

Fizzy is source-available under the O’Saasy License, not an OSI-approved open-source license. The license permits self-hosting, modification, and distribution, but restricts offering Fizzy as a competing hosted or SaaS service. This is disclosed in both application READMEs so that users and 1Panel maintainers can make an informed decision.