feat:add SSR start command support for sites

[HarshMN2345]

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Greptile Summary

This PR wires startCommand (the SSR start command) end-to-end: a shared type in sites.ts, the uploader, all sites.create/sites.update call-sites, and the UI fields in every creation and settings flow. The previous review's concerns about the field being shown unconditionally (deploy/+page.svelte), the empty-string passthrough (repository/+page.svelte), and the missing uploadSiteDeployment argument (manual/+page.svelte) have all been addressed in this revision. The only remaining note is a Svelte 5 anti-pattern in the merged $effect in updateBuildSettings.svelte where lastFrameworkAdapterKey is both read (as a tracked dependency) and written in the same effect, causing a no-op double-run and a development console warning.

Confidence Score: 4/5

Safe to merge; previously flagged P1 issues are addressed and the one remaining note is a cosmetic Svelte 5 anti-pattern.

All P1 findings from prior review rounds (unconditional field render, empty-string API passthrough, missing uploader argument) are resolved. The single open note is a P2 Svelte 5 double-run pattern that does not affect correctness.

src/routes/(console)/project-[region]-[project]/sites/site-[site]/settings/updateBuildSettings.svelte — lastFrameworkAdapterKey read/write in the same $effect.

Important Files Changed

Filename	Overview
src/lib/stores/sites.ts	Adds shared FrameworkAdapterWithStartCommand type extending Models.FrameworkAdapter, resolving the duplicate local type previously scattered across five files.
src/lib/stores/uploader.ts	Threads startCommand through uploadSiteDeployment, extracts deploymentPayload for clarity; no logic changes beyond the new field.
src/routes/(console)/project-[region]-[project]/sites/create-site/configuration.svelte	Adds startCommand prop, SSR-guarded input field, and adapterDefaultsKey debounce guard; ?? '' consistency applied to Reset disabled checks.
src/routes/(console)/project-[region]-[project]/sites/create-site/deploy/+page.svelte	Adds shouldShowStartCommand derived from adapters[0], guards Start Command field and API call behind SSR check, reads ?start URL param.
src/routes/(console)/project-[region]-[project]/sites/site-[site]/settings/updateBuildSettings.svelte	Merges two $effects into one with frameworkAdapterKey guard; adds startCommand state, SSR-guarded UI, and isUntouched tracking; changes selectedFramework from $derived to $state to enable user-editable selection.
src/routes/(console)/project-[region]-[project]/sites/create-site/repositories/repository-[repository]/+page.svelte	Adds startCommand and normalises all four commands to `
src/routes/(console)/project-[region]-[project]/sites/create-site/manual/+page.svelte	Passes startCommand to both sites.create and uploader.uploadSiteDeployment, and binds it through to the Configuration component.
src/routes/(console)/project-[region]-[project]/sites/site-[site]/deployments/createGitDeploymentModal.svelte	Passes `site.startCommand
src/routes/(public)/sites/deploy/+page.svelte	Forwards ?start URL parameter to the create-site deploy flow, consistent with install, build, and output params.

_{Reviews (9): Last reviewed commit: "fix sites repository create command norm..." | Re-trigger Greptile}