feat: integrate client and server sharing workflows

.env.example

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+# API only. Loopback binding lets a local frontend or host reverse proxy reach it.
+API_BIND_ADDRESS=127.0.0.1
+API_PORT=5000
+WEBDROP_IMAGE_REPO=zot.oeo.one/justme/webdrop-api
+WEBDROP_IMAGE_TAG=local
+
+WEBDROP_REQUESTS_PER_MINUTE=600
+WEBDROP_CREATES_PER_MINUTE=30
+WEBDROP_SWEEP_INTERVAL_SECONDS=30
+# Enable only when requests can arrive solely through a trusted reverse proxy.
+WEBDROP_TRUST_FORWARDED_HEADERS=false
+
+# Keep "none" for local development. Configure all Cap values to enable it.
+CAPTCHA_PROVIDER=none
+CAPTCHA_API_ENDPOINT=
+CAPTCHA_SITEVERIFY_URL=
+CAPTCHA_SECRET=
+CAPTCHA_TIMEOUT_SECONDS=5