revert: restore code fallbacks for config defaults

This reverts commit 153fc21. With no fallback in code, the deploy
crash-looped: Coolify keeps an entry for every variable compose.yml has
referenced, and empty entries appear to reach the containers as empty
values instead of the compose defaults.

compose.yml

@@ -11,18 +11,18 @@ services:
       MONGO_URL: ${MONGO_URL}                        # Atlas SRV string incl. credentials — SECRET
       MONGO_DATABASE: ${MONGO_DATABASE}              # e.g. miti99bot
 
-      # --- Access control (optional; empty means none / all) ---
-      MODULES: ${MODULES:-}                          # CSV of modules; empty = all modules
-      OWNER_ID: ${OWNER_ID:-}                        # Telegram user id for owner-only commands; empty = none
-      ADMIN_IDS: ${ADMIN_IDS:-}                      # CSV of admin Telegram user ids; empty = none
+      # --- Access control (optional; empty uses the default) ---
+      MODULES: ${MODULES}                            # CSV of modules; default: all modules
+      OWNER_ID: ${OWNER_ID}                          # Telegram user id for owner-only commands; default: none
+      ADMIN_IDS: ${ADMIN_IDS}                        # CSV of admin Telegram user ids; default: none
 
-      # --- Module settings (optional) ---
-      LOL_PANDASCORE_TOKEN: ${LOL_PANDASCORE_TOKEN:-}  # PandaScore token — SECRET; empty = /lol* fetches fail
-      GOLD_VNAPP_API_KEY: ${GOLD_VNAPP_API_KEY:-}      # VNAppMob key — SECRET; empty = fetched and cached in Mongo
-      STICKER_PACK_NAME: ${STICKER_PACK_NAME:-miti99_by_miti99bot}  # /addsticker set; must end in _by_<bot username>
+      # --- Module settings (optional; empty uses the default) ---
+      LOL_PANDASCORE_TOKEN: ${LOL_PANDASCORE_TOKEN}  # PandaScore token — SECRET; default: none (/lol* fetches fail)
+      GOLD_VNAPP_API_KEY: ${GOLD_VNAPP_API_KEY}      # VNAppMob key — SECRET; default: fetched and cached in Mongo
+      STICKER_PACK_NAME: ${STICKER_PACK_NAME}        # /addsticker set; default: miti99_by_miti99bot
 
-      # --- Runtime (defaults below; the code has no fallback) ---
-      LOG_LEVEL: ${LOG_LEVEL:-info}                  # debug|info|warn|error
+      # --- Runtime (optional; empty uses the default) ---
+      LOG_LEVEL: ${LOG_LEVEL}                        # debug|info|warn|error; default: info
 
       # --- Fixed by this stack (not Coolify settings) ---
       # The bundled renderer service below draws /wheelofnames, /gacha and
@@ -30,12 +30,12 @@ services:
       # platform-level value cannot point the bot elsewhere; the bot appends
       # each /api/<name> route itself.
       RENDERER_URL: http://renderer:3000
-      PORT: "8080"   # health server; keep in sync with the healthcheck below
 
       # --- Deliberately not declared ---
       # SOURCE_COMMIT: Coolify provides it at runtime via its generated env
       #   file; declaring it here with Compose interpolation can override the
       #   runtime value with an empty string.
+      # PORT: the health server defaults to 8080, which the healthcheck uses.
       # KV_PROVIDER: storage auto-selects mongodb because MONGO_URL is set.
       # Long polling = no TELEGRAM_WEBHOOK_SECRET, no /webhook, no public domain.
       # Cron is in-process only — no CRON_MODE, no /cron route, no secret.
@@ -70,11 +70,11 @@ services:
       # Every renderer setting carries the RENDERER_ prefix so it reads as a
       # renderer setting and cannot clash with the bot's variables.
 
-      # --- Tuning (defaults below; the renderer has no fallback) ---
-      RENDERER_MAX_CONCURRENT_RENDERS: ${RENDERER_MAX_CONCURRENT_RENDERS:-1}
-      RENDERER_RENDER_TIMEOUT_MS: ${RENDERER_RENDER_TIMEOUT_MS:-15000}  # floor 7000
-      RENDERER_MAX_OPTIONS: ${RENDERER_MAX_OPTIONS:-32}                 # wheel options
-      RENDERER_MAX_OPTION_CHARS: ${RENDERER_MAX_OPTION_CHARS:-40}       # chars per option/label
+      # --- Tuning (optional; empty uses the default) ---
+      RENDERER_MAX_CONCURRENT_RENDERS: ${RENDERER_MAX_CONCURRENT_RENDERS}  # default: 1
+      RENDERER_RENDER_TIMEOUT_MS: ${RENDERER_RENDER_TIMEOUT_MS}            # default: 15000 (floor 7000)
+      RENDERER_MAX_OPTIONS: ${RENDERER_MAX_OPTIONS}                        # default: 32 wheel options
+      RENDERER_MAX_OPTION_CHARS: ${RENDERER_MAX_OPTION_CHARS}              # default: 40 chars per option/label
 
       # --- Fixed by this stack (not Coolify settings) ---
       NODE_ENV: production