fix(appkit): exclude lakebase postgres.project from the bundle

[pkosiec]

project on the lakebase postgres resource is a discovery-only field. AppKit's
discovery walks project → branch → database (listing branches needs a project),
but the branch/database values it picks are already fully-qualified names that
embed the project — so project never needs to go into the app bundle.

databricks apps init ignores the manifest's discovery blocks, so it treated
project as a normal bundle field: it declared an unused postgres_project
variable, and non-interactive generation (--set) failed with

incomplete resource "postgres": missing fields [postgres.project]

Marking project as bundleIgnore (like endpointPath) keeps it available for
discovery but drops it from the bundle. Regenerating the appkit-* app templates
now works with just branch/database and no stray variable.

This pull request and its description were written by Isaac.

[github-actions]

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Scaffolds a new app from this PR's SDK build. Run it in any folder (requires the GitHub CLI — gh auth login — and the Databricks CLI):

gh run download 32965605615 -R databricks/appkit -n appkit-template-0.65.0-pr.4e05986-fix-generate-app-templates-lakebase-project-554 -D appkit-pr-554 \
  && unzip -o "appkit-pr-554/appkit-template-0.65.0-pr.4e05986-fix-generate-app-templates-lakebase-project-554.zip" -d "appkit-pr-554" \
  && databricks apps init --template "appkit-pr-554"

The template pins @databricks/appkit and @databricks/appkit-ui to tarballs built from this branch, so the scaffolded app runs against this PR's code.

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📦 Bundle size report

Compared against bundle-size-baseline.json (main).

@databricks/appkit

npm tarball (packed): 984 KB (-84 KB) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	1011 KB (-86 KB)	351 KB (-30 KB)
Type declarations	379 KB (-24 KB)	133 KB (-11 KB)
Source maps	2.0 MB (-184 KB)	662 KB (-60 KB)
Other	11 KB	3.7 KB
Total	3.3 MB (-294 KB)	1.1 MB (-102 KB)

Per-entry composition (own code — deps external (as shipped))

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
.	95 KB (+11 B)	2.5 KB	97 KB (+11 B)	external	311 KB (+16 B)
./beta	65 KB (+2 B)	457 B	65 KB (+2 B)	external	196 KB
./testing	17 KB	0 B	17 KB	external	50 KB
./tsdown	520 B	0 B	520 B	external	813 B
./type-generator	22 KB	0 B	22 KB	external	65 KB

Chunks:

Entry	Chunk	Load	Size (gz)
.	index.js	initial	91 KB
.	utils.js	initial	4.0 KB
.	remote-tunnel-manager.js	lazy	2.5 KB
./beta	beta.js	initial	49 KB
./beta	stream-manager.js	initial	5.8 KB
./beta	wide-event-emitter.js	initial	3.2 KB
./beta	databricks.js	initial	3.0 KB
./beta	configuration.js	initial	2.1 KB
./beta	service-context.js	initial	1.3 KB
./beta	client.js	initial	434 B
./beta	client-options.js	initial	220 B
./beta	supervisor-api.js	lazy	192 B
./beta	databricks.js	lazy	142 B
./beta	index.js	lazy	123 B
./testing	index.js	initial	17 KB
./tsdown	index.js	initial	520 B
./type-generator	index.js	initial	22 KB

@databricks/appkit-ui

npm tarball (packed): 348 KB (-8.1 KB) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	394 KB (-17 KB)	132 KB (-5.4 KB)
Type declarations	228 KB (-4.2 KB)	83 KB (-1.3 KB)
Source maps	764 KB (-16 KB)	252 KB (-5.0 KB)
CSS	16 KB	3.2 KB
Total	1.4 MB (-37 KB)	471 KB (-12 KB)

Per-entry composition (consumer bundle — deps bundled, peerDeps external)

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
./js	5.3 KB	49 KB	55 KB	208 KB	14 KB
./js/beta	20 B	0 B	20 B	0 B	0 B
./react	432 KB	49 KB	481 KB	1.3 MB	177 KB
./react/beta	1.0 KB	0 B	1.0 KB	0 B	1.9 KB

Chunks:

Entry	Chunk	Load	Size (gz)
./js	index.js	initial	5.2 KB
./js	chunk	initial	120 B
./js	apache-arrow	lazy	49 KB
./js/beta	beta.js	initial	20 B
./react	index.js	initial	430 KB
./react	tslib	initial	2.1 KB
./react	apache-arrow	lazy	49 KB
./react/beta	beta.js	initial	1.0 KB