feat(cli): add appkit doctor command

[IamGalymzhan]

appkit doctor - cli command that checks connectivity to the Databricks resources

The command does three level of checks:

1. auth - validates DATABRICKS_HOST and authenticates to the workspace
2. config - validates that each needed environmental variable is present (e.g. warehouse_id, genie_space_id)
3. existence - checks that given resource exists and reachable by read requests ( .get() or SELECT 1) to check connection

Output is a list of resources and problems if any with hints. Also there is option --json for machine readable output.

Examples:

Failed auth

Genie Space is not provided, Job is not accessible or doesn't exists

Everything is setup correctly

How it works:

1. Resolve all resources needed for the app from appkit.plugins.json
2. Auth: calls currentUser.me() to check that auth is fine
3. Config: for each resource declared checks that corresponding environmental variable is present
4. Existence: for each resource declared tries to connect and check if resource exists / has permission to access
5. Print a report for user or for the agent with --json option

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📦 Bundle size report

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

✅ No size changes vs the baseline.

@databricks/appkit

npm tarball (packed): 763 KB — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	791 KB	276 KB
Type declarations	285 KB	97 KB
Source maps	1.5 MB	515 KB
Other	11 KB	3.7 KB
Total	2.6 MB	892 KB

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

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
.	86 KB	2.5 KB	89 KB	external	281 KB
./beta	40 KB	231 B	40 KB	external	119 KB
./type-generator	19 KB	0 B	19 KB	external	54 KB

Chunks:

Entry	Chunk	Load	Size (gz)
.	index.js	initial	82 KB
.	utils.js	initial	4.0 KB
.	remote-tunnel-manager.js	lazy	2.5 KB
./beta	beta.js	initial	30 KB
./beta	databricks.js	initial	5.8 KB
./beta	service-context.js	initial	3.2 KB
./beta	client-options.js	initial	220 B
./beta	databricks.js	lazy	128 B
./beta	index.js	lazy	103 B
./type-generator	index.js	initial	19 KB

@databricks/appkit-ui

npm tarball (packed): 305 KB — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	359 KB	119 KB
Type declarations	205 KB	74 KB
Source maps	685 KB	224 KB
CSS	16 KB	3.3 KB
Total	1.2 MB	421 KB

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

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
./js	4.3 KB	49 KB	54 KB	208 KB	12 KB
./js/beta	20 B	0 B	20 B	0 B	0 B
./react	429 KB	49 KB	478 KB	1.3 MB	168 KB
./react/beta	20 B	0 B	20 B	0 B	0 B

Chunks:

Entry	Chunk	Load	Size (gz)
./js	index.js	initial	4.2 KB
./js	chunk	initial	120 B
./js	apache-arrow	lazy	49 KB
./js/beta	beta.js	initial	20 B
./react	index.js	initial	427 KB
./react	tslib	initial	2.1 KB
./react	apache-arrow	lazy	49 KB
./react/beta	beta.js	initial	20 B

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📦 Try this PR's app template

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 30265331104 -R databricks/appkit -n appkit-template-0.48.0-pr.1d287a9-feat-doctor-command-489 -D appkit-pr-489 \
  && unzip -o "appkit-pr-489/appkit-template-0.48.0-pr.1d287a9-feat-doctor-command-489.zip" -d "appkit-pr-489" \
  && databricks apps init --template "appkit-pr-489"

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.