Paseo build docs: README, mermaid diagram, Archify map — Docker on .13, pi provider, OmniRoute

docs/system.mmd

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+flowchart LR
+    subgraph CLIENTS["Clients"]
+        D27[".27 desktop<br/>paseo CLI"]
+        D51[".51 laptop<br/>paseo CLI"]
+        M["Mobile / web UI<br/>browser"]
+    end
+    subgraph S13["Paseo daemon (.13 — Docker, always-on)"]
+        D["Paseo daemon 0.7.2<br/>:6767 · auth"]
+        PI["pi agent 0.82.1<br/>pi --mode rpc<br/>@earendil pi + omni ext"]
+        CFG["pi config<br/>/home/paseo/.pi"]
+        W["workspaces<br/>/workspace/demo"]
+        PWD["PASEO_PASSWORD<br/>.env (600)"]
+    end
+    subgraph LLM["LLM routing"]
+        OR["OmniRoute<br/>.13:20129"]
+        OP["OpenCode-Go /<br/>OpenRouter / DeepSeek / Gemini"]
+    end
+    D27 -->|"PASEO_HOST + password"| D
+    D51 -->|"PASEO_HOST + password"| D
+    M -->|"https :6767"| D
+    D -->|"spawns / manages"| PI
+    PI -->|"reads settings + models"| CFG
+    PI -->|"works in"| W
+    D -->|"protects"| PWD
+    PI -->|"httpx /v1 (omni provider)"| OR
+    OR -->|"combo routing"| OP