Adds command-line flags to zddc-server alongside the existing env vars.
Each setting can be set via --<flag-name> or ZDDC_<NAME>; the flag wins
on conflict, the env var wins over the hard-coded default.
--root / ZDDC_ROOT (now defaults to CWD if both unset)
--addr / ZDDC_ADDR (:8443)
--tls-cert / ZDDC_TLS_CERT ("none" / empty / path)
--tls-key / ZDDC_TLS_KEY
--log-level / ZDDC_LOG_LEVEL (info)
--index-path / ZDDC_INDEX_PATH (.archive)
--email-header / ZDDC_EMAIL_HEADER (X-Auth-Request-Email)
--cors-origin / ZDDC_CORS_ORIGIN (https://zddc.varasys.io; "" disables)
--insecure-direct / ZDDC_INSECURE_DIRECT (false)
--help (prints flag list to stderr, exits 0)
--version (prints binary + embedded tool versions, exits 0)
So an operator can `cd /srv/zddc && zddc-server` with zero config — the
served root defaults to the current directory, and TLS defaults to a
self-signed cert. config.Load now takes []string (test-friendly: nil
skips flag parsing entirely; tests pass an empty slice for env-only
loads).
Adds a `version` package-level var in main.go injected at link time via
`-ldflags="-X main.version=..."`. The build.sh runs git describe against
zddc-server-v* tags; for in-flight commits between releases it produces
e.g. zddc-server-v0.0.7-19-gadb6904-dirty.
Adds an embedded versions manifest:
- Each tool's compute_build_label (in shared/build-lib.sh) writes a
sidecar <tool>.label to $BUILD_LABELS_DIR if that env var is set.
- Top-level build.sh sets BUILD_LABELS_DIR before running each tool's
build, then assembles zddc/internal/apps/embedded/versions.txt as
one `<app>=<build label>` line per app.
- apps.EmbeddedVersions() loads the manifest at runtime.
- main.go logs a compact summary on every startup; --version dumps
the full per-app label.
Removes the old cfg.BuildVersion field — the X-ZDDC-Source: embedded
header now uses the package-level main.version directly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
