ai: migrate LLM backbone from Kimi CLI to Codex CLI

Retires the Moonshot/Kimi subscription in favour of the already-paid ChatGPT
plan. Both CLI wrappers now run `codex exec`; the kimi-agent container is gone.

adolf-llm + hindsight-llm:
- runKimi -> runCodex (`codex exec --json --skip-git-repo-check`), resume via
  `codex exec resume <thread_id>`.
- MCP moves from a per-session .mcp.json (a workaround for Kimi having no
  --mcp-config-file flag) to a $CODEX_HOME/config.toml generated once at
  startup from shared-mcp.json. Field translation is load-bearing:
  bearerTokenEnvVar -> bearer_token_env_var, enabledTools -> enabled_tools.
- approval_policy="never" + sandbox_mode required, or unattended turns block
  on an approval prompt nobody can answer.

kimi-agent removed. It was the ONLY large-tier deployment behind LiteLLM, so
deleting it outright would have silently degraded every large-tier request to
the local 4B model via the existing fallbacks. tier-large, the auto_router
complex-reasoning route and their fallbacks now point at the codex-backed
adolf-llm wrapper (model_name: codex-agent).

Three environment blockers fixed along the way:
- OpenAI geo-blocks this host (403 unsupported_country_region_territory).
  Both containers now egress via the host xray proxy, with NO_PROXY keeping
  MCP and *.alogins.net traffic off the tunnel.
- node:22-slim ships no system CA store; the Rust codex binary validates TLS
  against it, so every HTTPS call failed with a generic transport error while
  Node's own fetch worked. ca-certificates added to both images.
- `codex exec resume` rejects -C/--cd (plain `codex exec` accepts it), which
  broke follow-up turns while first turns succeeded.

Known regression: Kimi's managed-usage API has no Codex equivalent, so the
/usage route returns 501 and there is no quota probe for the codex model.
The two quota plugins degrade quietly to no output.

Also: stop tracking cognee.env (live LLM + JWT secrets) and gitignore it.
The secrets remain in earlier history and should be rotated.

Verified live: plain turn, SSE streaming, session resume, MCP tool call,
bearer-token MCP call, and completions through both LiteLLM routes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014Y5QPagv4iun1ghpwM96Ff

ai/backup-llm-dbs.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+# Backup script for litellm-db and langfuse-db (openai stack postgres containers).
+# litellm-db holds provisioned virtual keys + spend; langfuse-db holds all traces.
+# Mirrors the seafile/vaultwarden backup.sh pattern (same repo): dump via
+# `docker exec <container> pg_dump`, gzip, retention of last 5. Uses pg_dump (safe
+# against a live/running DB, no downtime needed — unlike gitea's stop-the-world dump).
+# Backup-freshness monitored via .age items.
+#
+# Run every 3 days via root crontab (same schedule as vaultwarden/seafile), e.g.:
+#   0 3 */3 * * /home/alvis/agap_git/ai/backup-llm-dbs.sh >> /mnt/backups/openai-llm-dbs/backup.log 2>&1
+#
+# Restore (litellm-db example, langfuse-db is identical with its own container/user/db):
+#   gunzip -c /mnt/backups/openai-llm-dbs/<DATE>/litellm-db.sql.gz | \
+#     docker exec -i litellm-db psql -U litellm -d litellm
+#   # For langfuse-db:
+#   gunzip -c /mnt/backups/openai-llm-dbs/<DATE>/langfuse-db.sql.gz | \
+#     docker exec -i langfuse-db psql -U langfuse -d langfuse
+#   # If restoring into a fresh/empty DB, first drop+recreate the DB (or restore
+#   # to a new container) since the dump is a plain SQL dump, not --clean.
+
+set -euo pipefail
+
+BACKUP_DIR="/mnt/backups/openai-llm-dbs"
+
+DATE=$(date '+%Y%m%d-%H%M')
+DEST="$BACKUP_DIR/$DATE"
+
+mkdir -p "$DEST"
+# Backup-freshness monitoring is now done via .age items (calculated fields showing
+# age of the backup). The .ts (timestamp) trappers were unreliable (history.push not
+# landing); removed in kb#189 in favor of .age overdue triggers.
+
+# --- litellm-db ---
+echo "Dumping litellm-db..."
+docker exec litellm-db pg_dump -U litellm litellm | gzip > "$DEST/litellm-db.sql.gz"
+echo "Dumped: litellm-db -> $DEST/litellm-db.sql.gz"
+
+# --- langfuse-db ---
+echo "Dumping langfuse-db..."
+docker exec langfuse-db pg_dump -U langfuse langfuse | gzip > "$DEST/langfuse-db.sql.gz"
+echo "Dumped: langfuse-db -> $DEST/langfuse-db.sql.gz"
+
+echo "$(date): Backup complete: $DEST"
+ls -la "$DEST/"
+
+# Rotate: keep last 5 backups
+ls -1dt "$BACKUP_DIR"/[0-9]*-[0-9]* 2>/dev/null | tail -n +6 | xargs -r rm -rf