refactor(infra): drop ai profile; ollama + litellm move to Agap

Ollama and LiteLLM are shared Agap services (agap_git/openai/docker-compose.yml);
oO never starts them. Removes the ai profile, the litellm config, and the
--profile ai runbook; points ml-serving at https://llm.alogins.net by default
and adds host.docker.internal host-gateway so the container can hit Agap ollama
on the host.

Also updates the tip-generator model alias to qwen2.5:1.5b to match the model
actually pulled on Agap ollama (7b is ~4.7 GB and would blow VRAM budget).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env.example

@@ -10,10 +10,12 @@ API_BASE_URL=http://localhost:3078
 WEB_BASE_URL=http://localhost:3000
 ML_SERVING_URL=http://localhost:8000
 
-# AI stack — Ollama + LiteLLM (docker compose --profile ai)
-LITELLM_URL=http://localhost:4000
+# AI stack — shared Agap services (ollama + litellm + langfuse). Not run from oO.
+# Prod: https://llm.alogins.net  |  Dev: http://host.docker.internal:4000 from containers,
+# http://localhost:4000 from host. Ollama: http://host.docker.internal:11434 / :11434.
+LITELLM_URL=https://llm.alogins.net
 LITELLM_MASTER_KEY=sk-oo-dev
-OLLAMA_URL=http://localhost:11434
+OLLAMA_URL=http://host.docker.internal:11434
 
 # Google OAuth — https://console.cloud.google.com/
 GOOGLE_CLIENT_ID=