feat: add self-hosted memory providers (OpenViking, Honcho, Holographic)

- Add OpenViking service (knowledge graph) using official GHCR image
- Add Honcho stack (user modeling): API + PostgreSQL pgvector + Redis
- Add Holographic config to Hermes (local SQLite, no server needed)
- Hermes: install httpx for OpenViking client
- Hermes: auto-generate config.yaml + honcho.json on first boot
- All data 100% local, zero cloud dependencies

ai/hermes/honcho.json

@@ -0,0 +1,33 @@
+{
+  "enabled": true,
+  "apiKey": "",
+  "baseUrl": "http://honcho:8000",
+  "workspace": "hermes",
+  "peerName": "thierry",
+  "contextCadence": 2,
+  "dialecticCadence": 3,
+  "dialecticDepth": 2,
+  "dialecticReasoningLevel": "low",
+  "dialecticMaxChars": 600,
+  "recallMode": "hybrid",
+  "writeFrequency": "async",
+  "sessionStrategy": "per-directory",
+  "saveMessages": true,
+  "hosts": {
+    "hermes": {
+      "enabled": true,
+      "aiPeer": "hermes",
+      "recallMode": "hybrid",
+      "observation": {
+        "user": { "observeMe": true, "observeOthers": true },
+        "ai": { "observeMe": true, "observeOthers": true }
+      },
+      "dialecticDepth": 2,
+      "dialecticReasoningLevel": "low",
+      "dialecticMaxChars": 600,
+      "sessionStrategy": "per-directory",
+      "writeFrequency": "async",
+      "saveMessages": true
+    }
+  }
+}