fix: remove create_topic RPC and watch API

[Copilot]

Removes the wc_createTopic RPC method and the irn_watchRegister/irn_watchUnregister watch API, including all associated types, client methods, and the webhook example.

relay_rpc

• Removed CreateTopic, CreateTopicError and all watch types (WatchRegister, WatchUnregister, WatchError, WatchRegisterResponse)
• Removed Params::CreateTopic, Params::WatchRegister, Params::WatchUnregister enum variants
• Deleted rpc/watch.rs module entirely

relay_client

• Removed http::Client::create_topic, watch_register, watch_register_behalf, watch_unregister
• Removed WatchRegisterRequest, WatchUnregisterRequest, HttpClientError::Jwt
• Removed websocket::Client::create_topic
• Dropped unused origin field from http::Client (was only populated to support watch JWT claims)

root

• Deleted examples/webhook.rs and removed its [[example]] entry and warp dev-dependency

How Has This Been Tested?

Existing unit tests pass (cargo test -p relay_rpc -p relay_client).

Due Diligence

• Breaking change
• Requires a documentation update
• Requires a e2e/integration test update

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• binaries.soliditylang.org
  • Triggering command: /home/REDACTED/work/reown-rust/reown-rust/target/debug/build/relay_rpc-c16ca19e5d190591/out/../../../../.foundry/bin/forge /home/REDACTED/work/reown-rust/reown-rust/target/debug/build/relay_rpc-c16ca19e5d190591/out/../../../../.foundry/bin/forge build --contracts=relay_rpc/contracts --cache-path /home/REDACTED/work/reown-rust/reown-rust/target/debug/build/relay_rpc-c16ca19e5d190591/out/../../../../.foundry/forge/cache --out /home/REDACTED/work/reown-rust/reown-rust/target/debug/build/relay_rpc-c16ca19e5d190591/out/../../../../.foundry/forge/out 8bff5/build_script_build-7f48b6ffb558bff5.25hh9b8cgpung0klf2eux2wr6.0yetwzb.rcgucfg(feature, values()) 8bff5/build_script_build-7f48b6ffb558bff5.26nxbzwnhj0jun2idwhmpp51o.0yetwzb.rcgu-C 8bff5/build_script_build-7f48b6ffb558bff5.26phwlp9tw2xm5fx3bo2yxwjg.0yetwzb.rcgu.o 8bff5/build_script_build-7f48b6ffb558bff5.2g06m1oemylgspsn6o6b9qqjd.0yetwzb.rcgu.o 8bff5/build_script_build-7f48b6ffb558bff5.2gwcqiuke1fkyot6v86n0v7s6.0yetwzb.rcgu.o 8bff�� 8bff5/build_script_build-7f48b6ffb558bff5.2nf96x6renfbnl12hu9nfhx9h.0yetwzb.rcgu.o 8bff5/build_script_build-7f48b6ffb558bff5.2xjdbkpd3hnfhi2pztm3bp85k.0yetwzb.rcgu.o de/node/bin/as c 826f7a68079e6751-E pointer os.358bef6722a45-Wall (dns block)
  • Triggering command: /home/REDACTED/work/reown-rust/.codeql-scratch/dbs/rust/working/target/debug/build/relay_rpc-37c5f631bf17a953/out/../../../../.foundry/bin/forge /home/REDACTED/work/reown-rust/.codeql-scratch/dbs/rust/working/target/debug/build/relay_rpc-37c5f631bf17a953/out/../../../../.foundry/bin/forge build --contracts=relay_rpc/contracts --cache-path /home/REDACTED/work/reown-rust/.codeql-scratch/dbs/rust/working/target/debug/build/relay_rpc-37c5f631bf17a953/out/../../../../.foundry/forge/cache --out /home/REDACTED/work/reown-rust/.codeql-scratch/dbs/rust/working/target/debug/build/relay_rpc-37c5f631bf17a953/out/../../../../.foundry/forge/out /home/REDACTED/work/reown-rust/.codeql-scratch/dbs/rust/working/target/debug/deps/libsyn-e1c96a7797b61fd0.rlib futures_macro-3927f55cf91621ae.futures_macro.450e5fcfc49ae9a8-cgu.0.rcgu.o futures_macro-3927f55cf91621ae.futures_macro.450e5fcfc49ae9a8-cgu.1.rcgu.o futures_macro-3927f55cf91621ae.futures_macro.450e5fcfc49ae9a8-cgu.2.rcgu.o futures_macro-3927f55cf91621ae.futures_macro.450e5fcfc49ae9a8-cgu.3.rcgu.o futures_macro-3927f55cf91621ae.futures_macro.450e5fcfc49ae9a8-cgu.4.rcgu.o futures_macro-3927f55cf91621ae.futures_macro.450e5fcfc49ae9a8-cgu.5.rcgu.o /home/REDACTED/wor--json=diagnostic-rendered-ansi,artifacts,future-incompat futures_macro-3927f55cf91621ae.5ch9vxvn74xfbsh7re80ie1oa.rcgu.o 7543991641147detcc deql-scratch/dbs-Wl,--version-script=/tmp/rustcpflWNT/list libsyn-e1c96a7797b61fd0.rlib libquote-819bddae12a512e2.rlib (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[mario-reown]

@xDarksome do you think it would make sense to add metrics for the old endpoints just to be sure that nobody is using them or we can just merge as is?

[xDarksome]

@xDarksome do you think it would make sense to add metrics for the old endpoints just to be sure that nobody is using them or we can just merge as is?

We already have the metrics for the watch API, only notify is using it.

batch_fetch and fetch are not being removed, just deprecated and made no-op.

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