Rename app from chat to neoirc, binary to neoircd (closes #46)

- Rename Go module path: git.eeqj.de/sneak/chat -> git.eeqj.de/sneak/neoirc
- Rename binary: chatd -> neoircd, chat-cli -> neoirc-cli
- Rename cmd directories: cmd/chatd -> cmd/neoircd, cmd/chat-cli -> cmd/neoirc-cli
- Rename Go package: chatapi -> neoircapi
- Update Makefile: binary name, build targets, docker image tag, clean target
- Update Dockerfile: binary paths, user/group names, ENTRYPOINT
- Update .gitignore and .dockerignore
- Update all Go imports and doc comments
- Update default server name fallback: chat -> neoirc
- Update web client: localStorage keys, page title, default server name
- Update all schema $id URLs and example hostnames
- Update README.md: project name, binary references, examples, directory tree
- Update AGENTS.md: build command reference
- Update test fixtures: app name and channel names

Makefile

@@ -1,6 +1,6 @@
 .PHONY: all build lint fmt fmt-check test check clean run debug docker hooks
 
-BINARY := chatd
+BINARY := neoircd
 VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
 BUILDARCH := $(shell go env GOARCH)
 LDFLAGS := -X main.Version=$(VERSION) -X main.Buildarch=$(BUILDARCH)
@@ -8,7 +8,7 @@ LDFLAGS := -X main.Version=$(VERSION) -X main.Buildarch=$(BUILDARCH)
 all: check build
 
 build:
-	go build -ldflags "$(LDFLAGS)" -o bin/$(BINARY) ./cmd/chatd
+	go build -ldflags "$(LDFLAGS)" -o bin/$(BINARY) ./cmd/neoircd
 
 lint:
 	golangci-lint run --config .golangci.yml ./...
@@ -27,7 +27,7 @@ test:
 # Used by CI and Docker build — fails if anything is wrong
 check: test lint fmt-check
 	@echo "==> Building..."
-	go build -ldflags "$(LDFLAGS)" -o /dev/null ./cmd/chatd
+	go build -ldflags "$(LDFLAGS)" -o /dev/null ./cmd/neoircd
 	@echo "==> All checks passed!"
 
 run: build
@@ -37,10 +37,10 @@ debug: build
 	DEBUG=1 GOTRACEBACK=all ./bin/$(BINARY)
 
 clean:
-	rm -rf bin/ chatd
+	rm -rf bin/ neoircd
 
 docker:
-	docker build -t chat .
+	docker build -t neoirc .
 
 hooks:
 	@printf '#!/bin/sh\nset -e\n' > .git/hooks/pre-commit