add proof json and flow

assets/proof_of_observability_flow.md

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+# Proof-of-Observability Flow
+
+This document describes the core flow of how Obsero transforms raw service observations into decentralized, verifiable monitoring proofs.
+
+Each observation follows this lifecycle:
+
+```mermaid
+flowchart TD
+    A[Observer Probe] --> B[Ping Target]
+    B --> C[Generate JSON Observation]
+    C --> D[Hash + Sign Observation]
+    D --> E[Upload JSON to IPFS]
+    E --> F[Submit Hash + CID to Smart Contract]
+    F --> G[Proof is Publicly Verifiable (on-chain + IPFS)]

specs/prof_format_down_v0.1.json

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+{
+  "timestamp": "2025-04-29T14:05:00Z",
+  "target": "10.255.255.1",
+  "status": "down",
+  "latency_ms": null,
+  "error_message": "Destination Host Unreachable",
+  "observer": {
+    "address": "0x1234567890ABCDEF1234567890ABCDEF12345678",
+    "country": "France",
+    "region": "Île-de-France",
+    "city": "Paris",
+    "probe_version": "0.1"
+  },
+  "proof": {
+    "hash": "0xa2b3457df1e39bfe9f04d2e31d612ea1c4c135e4724db53a8c364c8eb1337e2a",
+    "signature": "0x304402200b3f9a...789def"
+  },
+  "version": "0.1"
+}

specs/prof_format_up_v0.1.json

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+{
+    "timestamp": "2025-04-29T14:00:00Z",
+    "target": "8.8.8.8",
+    "status": "up",
+    "latency_ms": 32,
+    "error_message": null,
+    "observer": {
+      "address": "0x1234567890ABCDEF1234567890ABCDEF12345678",
+      "country": "France",
+      "region": "Île-de-France",
+      "city": "Paris",
+      "probe_version": "0.1"
+    },
+    "proof": {
+      "hash": "0x8c5e3e81e8f304bd1c5b6a207d7553e51a3cd4e927df95a4c26c62f948b2a239",
+      "signature": "0x3045022100f1f5e3a...abc123"
+    },
+    "version": "0.1"
+  }
+