Add lectures folder with ethereum-crypto-2026 structure

lectures/ethereum-crypto-2026/00-preface.md

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+**Ethereum Cryptography — 2026**
+
+Lecture notes and references for the cryptography course.
+
+Main resource: https://drive.google.com/file/d/14ZOhQr4t-6Idd_ljeMCUexFQvCmd72cp/view
+
+Course page: https://study.epf.wiki/course/view.php?id=3
+
+---
+
+(TODO: dump intro notes, preliminary content, and any supplementary materials here)

lectures/ethereum-crypto-2026/01-finite-groups-fields.md

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+**Lecture 1 — Finite Groups & Fields**
+
+Main resource: https://drive.google.com/file/d/14ZOhQr4t-6Idd_ljeMCUexFQvCmd72cp/view
+
+---
+
+(TODO: notes)

lectures/ethereum-crypto-2026/02-discrete-fourier-transform.md

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+**Lecture 2 — Discrete Fourier Transform**
+
+Main resource: https://drive.google.com/file/d/14ZOhQr4t-6Idd_ljeMCUexFQvCmd72cp/view
+
+---
+
+(TODO: notes)

lectures/ethereum-crypto-2026/03-elliptic-curves-pairings.md

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+**Lecture 3 — Elliptic Curves & Pairings**
+
+Main resource: https://drive.google.com/file/d/14ZOhQr4t-6Idd_ljeMCUexFQvCmd72cp/view
+
+---
+
+(TODO: notes)

lectures/ethereum-crypto-2026/04-bls-signatures.md

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+**Lecture 4 — BLS Signatures**
+
+Main resource: https://drive.google.com/file/d/14ZOhQr4t-6Idd_ljeMCUexFQvCmd72cp/view
+
+---
+
+(TODO: notes)

lectures/ethereum-crypto-2026/05-proof-systems.md

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+**Lecture 5 — Proof Systems**
+
+Main resource: https://drive.google.com/file/d/14ZOhQr4t-6Idd_ljeMCUexFQvCmd72cp/view
+
+---
+
+(TODO: notes)