refactor: trim env.example to genuinely customer-facing config only

Full review of what belongs in the public installer vs. what customers
should never need to see, per an explicit audit request:

- Removed DB_USER/DB_NAME as customer-configurable env vars entirely --
  nothing outside this compose stack ever connects to Postgres directly,
  so there was no real reason a customer would ever change these.
  Hardcoded to postgres/argus in docker-compose.yml and the two scripts
  that referenced them (backup.sh, restore.sh); DB_PASSWORD remains the
  one real secret, still auto-generated by install.sh.
- Removed ANIS_ADMIN_KEY entirely -- confirmed dead in a prior session's
  audit: it's ANIS's own admin-dashboard credential, unrelated to the
  ARGUS<->ANIS intelligence protocol, which ARGUS never sends. Carried
  over into this file by copy-paste from ANIS's own env template, not
  because ARGUS ever uses it.
- Reordered/re-commented env.example around what a customer actually
  might touch (timezone, ANIS bootstrap trio, network ports for
  conflict resolution, DOCKER_API_VERSION for NAS platforms) versus
  what's fully automated (DB_PASSWORD) -- with an explicit note that
  ongoing product configuration (WAF, DNS, users, policies) happens in
  the dashboard, not this file.
- ANIS_ENABLED/ANIS_URL defaults aligned with the Community Edition
  auto-provisioning decision (true / https://anis.weboria.eu) --
  previously still showed the pre-decision false/empty defaults since
  this repo's initial population predated that change landing.
- Flagged CHANGELOG.md as stale (last entry v3.29.0, well behind the
  current shipped version) with an honest note rather than silently
  leaving a misleading "GitHub Releases page" pointer or backfilling
  invented descriptions of past releases.

No file needed to move to the private repo -- everything here (install/
update/backup/restore/healthcheck/uninstall scripts, the compose
manifest, license/notice docs) is either required for the customer to
install and operate ARGUS or a legal-transparency requirement. None of
it is build logic, dev configuration, or reproducible source.

env.example

@@ -1,65 +1,68 @@
-# ARGUS — Environment Configuration
-# Copy this file to .env and modify as needed. install.sh does this for you
-# automatically, including generating a secure DB_PASSWORD.
+# ARGUS Enterprise Web Security Platform — Installation Configuration
+#
+# install.sh generates this file for you automatically, including a secure
+# database password. Most installs need nothing beyond the defaults below.
+#
+# Everything else — WAF policy, DNS security, threat intelligence tuning,
+# proxy hosts, users, security policies — is configured from the ARGUS
+# dashboard after your first login, not from this file.
 
 # ===========================================
-# Required Settings
+# Database (do not edit)
 # ===========================================
-
-# Database password — install.sh generates this for you.
-# Manual value: openssl rand -base64 24
+# install.sh replaces this with a securely generated value on first install
+# and never touches it again. There's nothing to fill in here yourself.
 DB_PASSWORD=change-me-in-production
 
 # ===========================================
-# Optional Settings
+# Timezone
 # ===========================================
-
+# Should match the timezone you select in the dashboard's first-run setup
+# wizard (Regional Settings) — the wizard checks for a mismatch and will
+# warn you if this file and your dashboard selection disagree.
 TZ=UTC
-DB_USER=postgres
-DB_NAME=argus
 
 # ===========================================
-# ANIS — Threat Intelligence Integration
+# Threat Intelligence (ANIS)
 # ===========================================
-# ANIS is a separate product, deployed independently (self-hosted or via a
-# community instance). These vars configure how THIS ARGUS instance talks to
-# an already-running ANIS service — they do not start one.
-#
-# Set ANIS_ENABLED=true and ANIS_URL to turn on reporting WAF auto-bans to
-# ANIS and pulling its community threat-intelligence feed.
-
-ANIS_ENABLED=false
-# ANIS_URL=https://anis.example.com:8090
+# ARGUS connects to ANIS, Weboria's threat-intelligence network, by default
+# — no license key needed for the free Community tier. These three values
+# only matter on first boot; manage the connection afterward from
+# Threat Intel -> ANIS Connection in the dashboard.
+ANIS_ENABLED=true
+ANIS_URL=https://anis.weboria.eu
 ANIS_LICENSE_KEY=
-# Must match the ANIS instance's own ANIS_ADMIN_KEY. Generate: openssl rand -hex 32
-ANIS_ADMIN_KEY=
+
+# Share this instance's confirmed attacker IPs back to the community feed?
 ANIS_SHARE_ATTACKERS=false
 
 # ===========================================
-# Docker Compatibility (Synology DSM, etc.)
-# ===========================================
-
-# Leave empty for auto-detection. Only set if auto-detection fails.
-# Synology DSM typically needs: 1.41 or 1.43
-# DOCKER_API_VERSION=1.41
-
-# ===========================================
-# Network & Port Settings
+# Network Ports
 # ===========================================
+# Only change these if the defaults conflict with something else already
+# running on this host.
 
 # Admin panel port (default: 81)
 # UI_PORT=81
 
-# Nginx listen ports — change if 80/443 are already in use
-# (e.g. Synology Web Station)
+# Reverse-proxy listen ports — change if 80/443 are already in use
 # NGINX_HTTP_PORT=8080
 # NGINX_HTTPS_PORT=8443
 
-# API host port — exposed for nginx-to-API communication.
+# Internal port used for nginx<->API communication.
 # MUST NOT conflict with NGINX_HTTP_PORT.
 # API_HOST_PORT=9080
 
 # DNS Security Engine listen address — host-only (127.0.0.1) by default.
-# Set to an internal interface IP to route real client DNS traffic through
-# it. Never 0.0.0.0 unless this host is on a fully trusted network.
+# Set to an internal interface IP only if you intend to route real client
+# DNS traffic through ARGUS. Never 0.0.0.0 unless this host is on a fully
+# trusted network — an open forwarding resolver is exactly the profile
+# abused for DNS amplification attacks against third parties.
 # DNS_LISTEN_HOST=127.0.0.1
+
+# ===========================================
+# Advanced / Troubleshooting
+# ===========================================
+# Only needed on some NAS platforms (e.g. Synology DSM) where Docker's API
+# version needs to be pinned manually. Leave commented out otherwise.
+# DOCKER_API_VERSION=1.41