fix: resolve remaining CI issues — services, hardhat, Rust, mypy

Service health checks:
- Exchange API uses /api/health not /health — updated test script
  and workflow wait loops to check /api/health as fallback
- Increased wait time to 2s intervals, 15 retries for service readiness
- Performance tests now hit /health endpoints (not root /)

Hardhat compilation:
- aitbc-token was missing peer deps for @nomicfoundation/hardhat-toolbox
- Installed all 11 required peer packages (ethers, typechain, etc.)
- Contracts now compile (19 Solidity files) and all 17 tests pass

Rust workflow:
- Fixed HOME mismatch: gitea-runner HOME=/opt/gitea-runner vs
  euid root HOME=/root — explicitly set HOME=/root in all steps
- Set RUSTUP_HOME and CARGO_HOME for consistent toolchain location

Mypy type annotations (aitbc-agent-sdk):
- agent.py: narrow key types to RSA (isinstance check before sign/verify),
  fix supported_models Optional type, add __post_init__ return type
- compute_provider.py: add return types to all methods, declare
  pricing_model/dynamic_pricing attrs, rename register→create_provider
  to avoid signature conflict with parent, fix Optional safety
- swarm_coordinator.py: add return types to all 8 untyped methods

packages/py/aitbc-agent-sdk/src/aitbc_agent/agent.py

@@ -21,12 +21,12 @@ class AgentCapabilities:
     """Agent capability specification"""
     compute_type: str  # "inference", "training", "processing"
     gpu_memory: Optional[int] = None
-    supported_models: List[str] = None
+    supported_models: Optional[List[str]] = None
     performance_score: float = 0.0
     max_concurrent_jobs: int = 1
     specialization: Optional[str] = None
     
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         if self.supported_models is None:
             self.supported_models = []
 
@@ -47,6 +47,9 @@ class AgentIdentity:
             password=None
         )
         
+        if not isinstance(private_key, rsa.RSAPrivateKey):
+            raise TypeError("Only RSA private keys are supported")
+        
         signature = private_key.sign(
             message_str.encode(),
             padding.PSS(
@@ -65,6 +68,9 @@ class AgentIdentity:
             self.public_key.encode()
         )
         
+        if not isinstance(public_key, rsa.RSAPublicKey):
+            raise TypeError("Only RSA public keys are supported")
+        
         try:
             public_key.verify(
                 bytes.fromhex(signature),