feat: Turn off certain features of quota popup for self-hosting (#703)

* feat: Turn off certain features of quota popup for self-hosting

This commit introduces a new variable, NEXT_PUBLIC_SELFHOSTED,
that alters the behavior of the quota popup. Downstream
consumers of the application may have their own quota-checking
logic, and the front-end reacts to the 429 error by displaying
the quota popup.  In the case of a self-hosted version of the app,
it is inappropriate to ask for sponsorship or provide a
hyperlink to the public version of the tool to apply for an
increased quota. An alternative string translation is provided
with an empty message for adopter customization.

To use this feature, compile with NEXT_PUBLIC_SELFHOSTED=true
and those parts of the quota popup will be omitted.
The downstream consumer is still expected to customize
the internationalized strings for the popup content
to be appropriate to their organization on their local forks.

Signed-off-by: Bryon Nevis <bryon.nevis@intel.com>

* refactor: improve readability and provide sensible selfhosted defaults

- Extract nested ternary expressions into quotaMessage and tipHtml variables
- Combine two separate !isSelfHosted conditional blocks into one
- Replace null tipSelfHosted with meaningful default strings across all locales

---------

Signed-off-by: Bryon Nevis <bryon.nevis@intel.com>
Co-authored-by: dayuan.jiang <jdy.toh@gmail.com>

Dockerfile

@@ -35,6 +35,11 @@ ENV NEXT_PUBLIC_SHOW_ABOUT_AND_NOTICE=${NEXT_PUBLIC_SHOW_ABOUT_AND_NOTICE}
 ARG NEXT_PUBLIC_BASE_PATH=""
 ENV NEXT_PUBLIC_BASE_PATH=${NEXT_PUBLIC_BASE_PATH}
 
+# Control sponsorship and self-hosting messaging in quota notifications.
+# Set NEXT_PUBLIC_SELFHOSTED="true" in self-hosted deployments to hide sponsorship/self-host links and related text in quota popups.
+ARG NEXT_PUBLIC_SELFHOSTED=""
+ENV NEXT_PUBLIC_SELFHOSTED="${NEXT_PUBLIC_SELFHOSTED}"
+
 # Build Next.js application (standalone mode)
 RUN npm run build