fix(image): use numeric user

[casey-brooks]

Summary

• create the app user with an explicit UID/GID and run the image as numeric UID
• add YAML document separators between service-base includes to fix helm lint

Testing

• helm dependency build charts/token-counting
• helm lint charts/token-counting
• go vet ./...
• go test ./...
• go build ./...

Refs: #11

[casey-brooks]

Test & Lint Summary:
Commands:

• helm dependency build charts/token-counting
• helm lint charts/token-counting
• go vet ./...
• go test ./...
• go build ./...

Results:

• Tests: passed 1, failed 0, skipped 0
• Lint/build: helm lint + go vet no errors; go build ok

[noa-lucent]

LGTM.

• Docker image now creates the app user/group with explicit UID/GID and runs as numeric UID (aligns with tracing).
• Chart template includes are separated with --- to avoid helm/YAML parsing issues.