Refactor signer implementation to use p8k package

- Replaced all instances of p256k1signer with the new p8k.Signer across various modules, including event creation, policy handling, and database interactions.
- Updated related test cases and benchmarks to ensure compatibility with the new signer interface.
- Bumped version to v0.25.0 to reflect these significant changes and improvements in cryptographic operations.

pkg/crypto/p8k/bench/BENCHMARK_RESULTS.md

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+# Performance Benchmark Results
+
+## Test Environment
+
+- **CPU**: AMD Ryzen 5 PRO 4650G with Radeon Graphics  
+- **OS**: Linux (amd64)
+- **Date**: November 4, 2025
+- **Benchmark Time**: 1 second per test
+
+## Implementations Compared
+
+1. **BTCEC** - btcsuite/btcd/btcec/v2 (Pure Go)
+2. **P256K1** - p256k1.mleku.dev v1.0.2 (Pure Go) 
+3. **P8K** - p8k.mleku.dev (Purego + libsecp256k1 v5.0.0)
+
+## Results Summary
+
+| Operation           | BTCEC (ns/op) | P256K1 (ns/op) | **P8K (ns/op)** | P8K Speedup vs BTCEC | P8K Speedup vs P256K1 |
+|---------------------|---------------|----------------|-----------------|----------------------|-----------------------|
+| **Pubkey Derivation** | 32,226      | 28,098         | **19,329**      | **1.67x faster** ✨  | 1.45x faster          |
+| **Schnorr Sign**      | 225,536     | 28,855         | **19,982**      | **11.3x faster** 🚀  | 1.44x faster          |
+| **Schnorr Verify**    | 153,205     | 133,235        | **36,541**      | **4.19x faster** ⚡  | 3.65x faster          |
+| **ECDH**              | 125,679     | 97,435         | **41,087**      | **3.06x faster** 💨  | 2.37x faster          |
+
+## Memory Allocations
+
+| Operation           | BTCEC         | P256K1      | P8K         |
+|---------------------|---------------|-------------|-------------|
+| Pubkey Derivation   | 80 B / 1 alloc | 0 B / 0 alloc | 160 B / 4 allocs |
+| Schnorr Sign        | 1408 B / 26 allocs | 640 B / 12 allocs | 304 B / 5 allocs |
+| Schnorr Verify      | 240 B / 5 allocs | 96 B / 3 allocs | 216 B / 5 allocs |
+| ECDH                | 32 B / 1 alloc | 0 B / 0 alloc | 208 B / 6 allocs |
+
+## Key Findings
+
+### 🏆 P8K Wins All Categories
+
+**P8K consistently outperforms both pure Go implementations:**
+
+- **Schnorr Signing**: 11.3x faster than BTCEC, making it ideal for high-throughput signing operations
+- **Schnorr Verification**: 4.2x faster than BTCEC, excellent for validation-heavy workloads  
+- **ECDH**: 3x faster than BTCEC, great for key exchange protocols
+- **Pubkey Derivation**: 1.67x faster than BTCEC
+
+### Memory Efficiency
+
+- **P256K1** has the best memory efficiency with zero allocations for pubkey derivation and ECDH
+- **P8K** has reasonable memory usage with more allocations due to the FFI boundary
+- **BTCEC** has higher memory overhead, especially for Schnorr operations (1408 B/op)
+
+### Trade-offs
+
+**P8K (This Package)**
+- ✅ Best performance across all operations
+- ✅ Uses battle-tested C implementation
+- ✅ Bundled library for Linux AMD64 (zero installation)
+- ⚠️ Requires libsecp256k1 on other platforms
+- ⚠️ Slightly more memory allocations (FFI overhead)
+
+**P256K1**
+- ✅ Pure Go (no dependencies)
+- ✅ Zero allocations for some operations
+- ✅ Good performance overall
+- ⚠️ ~1.5x slower than P8K
+
+**BTCEC**
+- ✅ Pure Go (no dependencies)
+- ✅ Well-tested in Bitcoin ecosystem
+- ✅ Reasonable performance for most use cases
+- ⚠️ Significantly slower for Schnorr operations
+- ⚠️ Higher memory usage
+
+## Recommendations
+
+**Choose P8K if:**
+- You need maximum performance
+- You're on Linux AMD64 (bundled library)
+- You can install libsecp256k1 on other platforms
+- You're building high-throughput systems
+
+**Choose P256K1 if:**
+- You need pure Go (no external dependencies)
+- Memory efficiency is critical
+- Performance is good enough for your use case
+
+**Choose BTCEC if:**
+- You're already using btcsuite packages
+- You need Bitcoin-specific features
+- Performance is not critical
+
+## Conclusion
+
+**P8K delivers exceptional performance** by leveraging the highly optimized C implementation of libsecp256k1 through CGO-free dynamic loading. The 11x speedup for Schnorr signing makes it ideal for applications requiring high-throughput cryptographic operations.
+
+The bundled library for Linux AMD64 provides **zero-installation convenience** while maintaining the performance benefits of the native C library.
+
+